diff --git a/js/common/DensityBuoyancyCommonConstants.ts b/js/common/DensityBuoyancyCommonConstants.ts
index a1809972..e2d4ed64 100644
--- a/js/common/DensityBuoyancyCommonConstants.ts
+++ b/js/common/DensityBuoyancyCommonConstants.ts
@@ -45,7 +45,6 @@ export const chooseDecimalPlaces = ( value: number ): number => {
 
 const LITERS_IN_CUBIC_METER = 1000;
 
-
 const FLUID_DENSITY_RANGE_PER_L = new Range( 0.5, 15 );
 
 const DensityBuoyancyCommonConstants = {
diff --git a/js/common/view/ABControlsNode.ts b/js/common/view/ABControlsNode.ts
index f1447df7..b6b145bf 100644
--- a/js/common/view/ABControlsNode.ts
+++ b/js/common/view/ABControlsNode.ts
@@ -29,12 +29,12 @@ export default class ABControlsNode extends ABPanelsNode {
    * @param massA
    * @param massB
    * @param popupLayer
-   * @param options - Applied to each BlockControlNode
+   * @param blockControlNodeOptions - Applied to each BlockControlNode
    */
-  public constructor( massA: Cuboid, massB: Cuboid, popupLayer: Node, options: ABControlsNodeOptions ) {
+  public constructor( massA: Cuboid, massB: Cuboid, popupLayer: Node, blockControlNodeOptions: ABControlsNodeOptions ) {
 
-    const tandem = options.tandem;
-    const omittedOptions = _.omit( options, [ 'tandem' ] );
+    const tandem = blockControlNodeOptions.tandem;
+    const omittedOptions = _.omit( blockControlNodeOptions, [ 'tandem' ] );
 
     const controlANode = new BlockControlNode( massA, popupLayer, true, combineOptions<BlockControlNodeOptions>( {
       labelNode: ABPanelsNode.getTagALabelNode(),
diff --git a/js/common/view/BackgroundEventTargetListener.ts b/js/common/view/BackgroundEventTargetListener.ts
index 617832ac..9feb292d 100644
--- a/js/common/view/BackgroundEventTargetListener.ts
+++ b/js/common/view/BackgroundEventTargetListener.ts
@@ -127,6 +127,8 @@ export default class BackgroundEventTargetListener implements TInputListener {
         this.releaseSoundPlayer.play();
         this.endDragAction.execute( mass );
       };
+
+      // TODO: Add a type annotation so we can track down documentation for createPanTargetBounds, see https://github.com/phetsims/density-buoyancy-common/issues/123
       const listener = {
         // end drag on either up or cancel (not supporting full cancel behavior)
         up: endDrag,
diff --git a/js/common/view/BlocksModeRadioButtonGroup.ts b/js/common/view/BlocksModeRadioButtonGroup.ts
index 750ef112..25b3cf88 100644
--- a/js/common/view/BlocksModeRadioButtonGroup.ts
+++ b/js/common/view/BlocksModeRadioButtonGroup.ts
@@ -27,6 +27,7 @@ const bMaterial = new THREE.MeshLambertMaterial();
 
 const ICON_SCALE = 0.15;
 
+// TODO: Add helpful documentation please, see https://github.com/phetsims/density-buoyancy-common/issues/257
 // These live for the lifetime of the simulation, so we don't need to remove this listener
 DensityBuoyancyCommonColors.tagAProperty.link( labelColor => {
   aMaterial.color = ThreeUtils.colorToThree( labelColor );
diff --git a/js/common/view/BlocksPanel.ts b/js/common/view/BlocksPanel.ts
index 9930f94f..efde5a63 100644
--- a/js/common/view/BlocksPanel.ts
+++ b/js/common/view/BlocksPanel.ts
@@ -27,6 +27,8 @@ export default class BlocksPanel extends Panel {
         createNode: tandem => new Text( blockSet.stringProperty, {
           font: DensityBuoyancyCommonConstants.RADIO_BUTTON_FONT,
           maxWidth: 160,
+
+          // TODO: This looks like a rare occasion where we instrumented a Text, but normally we don't instrument those. Can this be uninstrumented? See https://github.com/phetsims/density-buoyancy-common/issues/123
           tandem: tandem.createTandem( 'labelText' )
         } ),
         value: blockSet,
@@ -58,7 +60,6 @@ export default class BlocksPanel extends Panel {
         phetioFeatured: true
       }
     }, DensityBuoyancyCommonConstants.PANEL_OPTIONS ) );
-
   }
 }
 
diff --git a/js/common/view/ComboNumberControl.ts b/js/common/view/ComboNumberControl.ts
index 071baad2..eca5488b 100644
--- a/js/common/view/ComboNumberControl.ts
+++ b/js/common/view/ComboNumberControl.ts
@@ -38,6 +38,7 @@ type SelfOptions<T extends Material | Gravity> = {
 
   comboItems: ComboBoxItem<T>[];
 
+  // TODO: What is a fallback node? When is it shown? https://github.com/phetsims/density-buoyancy-common/issues/257
   getFallbackNode?: ( t: T ) => Node | null;
 
   numberControlOptions?: NumberControlOptions;
diff --git a/js/common/view/ComparisonNumberControl.ts b/js/common/view/ComparisonNumberControl.ts
index 933aa429..62b769d6 100644
--- a/js/common/view/ComparisonNumberControl.ts
+++ b/js/common/view/ComparisonNumberControl.ts
@@ -1,7 +1,7 @@
 // Copyright 2021-2024, University of Colorado Boulder
 
 /**
- * Supertype for the NumberControls in the Compare screen
+ * Subtype for the NumberControls in the Compare screen, see BlocksValuePanel.
  *
  * @author Jonathan Olson (PhET Interactive Simulations)
  */
diff --git a/js/common/view/DensityBuoyancyScreenView.ts b/js/common/view/DensityBuoyancyScreenView.ts
index 5853a5df..90b90e9d 100644
--- a/js/common/view/DensityBuoyancyScreenView.ts
+++ b/js/common/view/DensityBuoyancyScreenView.ts
@@ -2,6 +2,8 @@
 
 /**
  * The main base ScreenView for all Density/Buoyancy screens.
+ * TODO: Elaborate on the main responsibilities of this class, see https://github.com/phetsims/density-buoyancy-common/issues/257
+ * TODO: Currently at 871 lines, this file is more complex. Can it be simplified or modularized? See https://github.com/phetsims/density-buoyancy-common/issues/123
  *
  * @author Jonathan Olson (PhET Interactive Simulations)
  */
@@ -89,7 +91,7 @@ export default class DensityBuoyancyScreenView<Model extends DensityBuoyancyMode
   private readonly backgroundLayer: Node;
   protected readonly resetAllButton: Node;
 
-  // The sky background, in a unit 0-to-1 rectangle (so we can scale it to match)
+  // The sky background
   private readonly backgroundNode: Rectangle;
 
   protected readonly sceneNode: ThreeIsometricNode;
@@ -100,6 +102,7 @@ export default class DensityBuoyancyScreenView<Model extends DensityBuoyancyMode
 
   private readonly debugView?: DebugView;
 
+  // TODO: What are these for? See https://github.com/phetsims/density-buoyancy-common/issues/257
   // Subtypes can provide their own values to control the barrier sizing.
   private readonly leftBarrierViewPointPropertyProperty: Property<TReadOnlyProperty<Vector2>>;
   protected readonly rightBarrierViewPointPropertyProperty: Property<TReadOnlyProperty<Vector2>>;
@@ -154,6 +157,7 @@ export default class DensityBuoyancyScreenView<Model extends DensityBuoyancyMode
     } );
     this.addChild( this.backgroundNode );
 
+    // TODO: The backgroundNode is behind the backgroundLayer, please document, see https://github.com/phetsims/density-buoyancy-common/issues/257
     this.backgroundLayer = new Node();
     this.addChild( this.backgroundLayer );
 
@@ -205,7 +209,7 @@ export default class DensityBuoyancyScreenView<Model extends DensityBuoyancyMode
       this.massViews,
       this.getMassViewUnderPointer.bind( this ),
       this.sceneNode.getRayFromScreenPoint.bind( this.sceneNode ),
-      ( point: Vector3 ) => this.localToGlobalPoint( this.modelToViewPoint( point ) ),
+      point => this.localToGlobalPoint( this.modelToViewPoint( point ) ),
       updateCursor,
       this.tandem.createTandem( 'backgroundEventTargetListener' )
     );
@@ -350,7 +354,7 @@ export default class DensityBuoyancyScreenView<Model extends DensityBuoyancyMode
       topColorArray[ offset + 8 ] = topColorArray[ offset + 14 ] = topColorArray[ offset + 17 ] = grassFarColor.b / 255;
       topGeometry.attributes.color.needsUpdate = true;
     } );
-    // @ts-expect-error - THREE.js version incompat?
+    // @ts-expect-error - THREE.js version incompatibility?
     const topMaterial = new THREE.MeshBasicMaterial( { vertexColors: THREE.VertexColors } );
     const topMesh = new THREE.Mesh( topGeometry, topMaterial );
     this.sceneNode.stage.threeScene.add( topMesh );
@@ -453,6 +457,7 @@ export default class DensityBuoyancyScreenView<Model extends DensityBuoyancyMode
         opacity: 0.5
       } );
 
+      // TODO: Document the purpose of this link, see https://github.com/phetsims/density-buoyancy-common/issues/257
       // This instance lives for the lifetime of the simulation, so we don't need to remove this listener
       model.invisibleBarrierBoundsProperty.link( bounds => {
         let index = 0;
@@ -503,7 +508,6 @@ export default class DensityBuoyancyScreenView<Model extends DensityBuoyancyMode
     model.masses.forEach( onMassAdded );
 
     const onMassRemoved = ( mass: Mass ) => {
-      // Mass view
       const massView = _.find( this.massViews, massView => massView.mass === mass )!;
 
       // Remove the mass view
@@ -515,6 +519,8 @@ export default class DensityBuoyancyScreenView<Model extends DensityBuoyancyMode
 
     const fluidLevelIndicator = new FluidLevelIndicator( model.pool.fluidLevelVolumeProperty );
     this.addChild( fluidLevelIndicator );
+
+    // TODO: Document the reason for this link: https://github.com/phetsims/density-buoyancy-common/issues/257
     // This instance lives for the lifetime of the simulation, so we don't need to remove this listener
     model.pool.fluidYInterpolatedProperty.link( fluidY => {
       const modelPoint = new Vector3( model.poolBounds.minX, fluidY, model.poolBounds.maxZ );
@@ -831,7 +837,6 @@ export default class DensityBuoyancyScreenView<Model extends DensityBuoyancyMode
     return array;
   }
 
-
   /**
    * Fills the positionArray with an X,Z cross-section of the fluid around a boat at a given y value (for a given liters
    * value).
diff --git a/js/common/view/EllipsoidView.ts b/js/common/view/EllipsoidView.ts
index f2886bc0..9bf4607f 100644
--- a/js/common/view/EllipsoidView.ts
+++ b/js/common/view/EllipsoidView.ts
@@ -17,17 +17,15 @@ import DisplayProperties from '../../buoyancy/view/DisplayProperties.js';
 
 export default class EllipsoidView extends MeasurableMassView {
 
-  private readonly ellipsoid: Ellipsoid;
   private readonly ellipsoidGeometry: THREE.SphereGeometry;
   private readonly updateListener: ( newSize: Bounds3 ) => void;
 
-  public constructor( ellipsoid: Ellipsoid, modelViewTransform: THREEModelViewTransform, displayProperties: DisplayProperties ) {
+  public constructor( private readonly ellipsoid: Ellipsoid, modelViewTransform: THREEModelViewTransform, displayProperties: DisplayProperties ) {
 
     const ellipsoidGeometry = new THREE.SphereGeometry( 0.5, 30, 24 );
 
     super( ellipsoid, ellipsoidGeometry, modelViewTransform, displayProperties );
 
-    this.ellipsoid = ellipsoid;
     this.ellipsoidGeometry = ellipsoidGeometry;
 
     const positionTag = () => {
diff --git a/js/common/view/FluidLevelIndicator.ts b/js/common/view/FluidLevelIndicator.ts
index 6164a8e4..f651f741 100644
--- a/js/common/view/FluidLevelIndicator.ts
+++ b/js/common/view/FluidLevelIndicator.ts
@@ -15,7 +15,6 @@ import Panel from '../../../../sun/js/Panel.js';
 import densityBuoyancyCommon from '../../densityBuoyancyCommon.js';
 import DensityBuoyancyCommonConstants from '../DensityBuoyancyCommonConstants.js';
 import DensityBuoyancyCommonColors from './DensityBuoyancyCommonColors.js';
-import Tandem from '../../../../tandem/js/Tandem.js';
 
 export default class FluidLevelIndicator extends Node {
 
@@ -29,11 +28,9 @@ export default class FluidLevelIndicator extends Node {
     } );
     this.addChild( highlightPath );
 
-    // This instance lives for the lifetime of the simulation, so we don't need to remove this listener
     const readoutText = new RichText( new PatternStringProperty( DensityBuoyancyCommonConstants.VOLUME_PATTERN_STRING_PROPERTY, {
       value: volumeProperty
     }, {
-      tandem: Tandem.OPT_OUT,
       decimalPlaces: 2
     } ), {
       font: new PhetFont( { size: 18 } ),
@@ -41,7 +38,6 @@ export default class FluidLevelIndicator extends Node {
     } );
 
     const readoutPanel = new Panel( readoutText, {
-      // Not using the typical margins for UI panels in this sim
       cornerRadius: DensityBuoyancyCommonConstants.CORNER_RADIUS
     } );
     this.addChild( readoutPanel );
diff --git a/js/common/view/LabelTexture.ts b/js/common/view/LabelTexture.ts
deleted file mode 100644
index cf45aeeb..00000000
--- a/js/common/view/LabelTexture.ts
+++ /dev/null
@@ -1,40 +0,0 @@
-// Copyright 2020-2024, University of Colorado Boulder
-
-/**
- * A wrapper for NodeTexture that scales it up and uses power-of-2 dimensions.
- *
- * @author Jonathan Olson (PhET Interactive Simulations)
- */
-
-import NodeTexture from '../../../../mobius/js/NodeTexture.js';
-import { Node } from '../../../../scenery/js/imports.js';
-import densityBuoyancyCommon from '../../densityBuoyancyCommon.js';
-
-export default class LabelTexture extends NodeTexture {
-
-  private readonly containerNode: Node;
-
-  public constructor( labelNode: Node ) {
-    const containerNode = new Node( {
-      children: [ labelNode ],
-      scale: 2
-    } );
-
-    super( containerNode, {
-      calculateDimensionFromNode: true
-    } );
-
-    this.containerNode = containerNode;
-  }
-
-  /**
-   * Releases references
-   */
-  public override dispose(): void {
-    this.containerNode.dispose();
-
-    super.dispose();
-  }
-}
-
-densityBuoyancyCommon.register( 'LabelTexture', LabelTexture );
\ No newline at end of file
diff --git a/js/common/view/MassDecorationLayer.ts b/js/common/view/MassDecorationLayer.ts
index 60116ce1..9b0992b3 100644
--- a/js/common/view/MassDecorationLayer.ts
+++ b/js/common/view/MassDecorationLayer.ts
@@ -1,7 +1,6 @@
 // Copyright 2024, University of Colorado Boulder
 
 /**
- *
  * A containing Node for all decoration layers that are set on top of the THREE stage Node. This pattern was developed
  * because it is much easier to super-impose scenery content onto THREE graphics in an overlay, than it is to try to
  * re-render the scenery content into the THREE state. See https://github.com/phetsims/density-buoyancy-common/issues/112
diff --git a/js/common/view/MassLabelNode.ts b/js/common/view/MassLabelNode.ts
index cd910af5..b7937e4e 100644
--- a/js/common/view/MassLabelNode.ts
+++ b/js/common/view/MassLabelNode.ts
@@ -22,7 +22,6 @@ import Utils from '../../../../dot/js/Utils.js';
 
 export default class MassLabelNode extends Node {
 
-  private readonly mass: Mass;
   private readonly showMassValuesProperty: TReadOnlyProperty<boolean>;
   private readonly showMassesListener: ( n: boolean ) => void;
   private readonly readoutStringProperty: TReadOnlyProperty<string>;
@@ -65,7 +64,6 @@ export default class MassLabelNode extends Node {
 
     this.addChild( readoutPanel );
 
-    this.mass = mass;
     this.showMassValuesProperty = showMassValuesProperty;
 
     // Keep it centered
diff --git a/js/common/view/MassTagNode.ts b/js/common/view/MassTagNode.ts
index 950fdd30..b3dc8606 100644
--- a/js/common/view/MassTagNode.ts
+++ b/js/common/view/MassTagNode.ts
@@ -32,7 +32,6 @@ export default class MassTagNode extends Node {
   public constructor( massTag: MassTag, maxTextWidth = 100 ) {
 
     assert && assert( massTag !== MassTag.NONE, 'MassTagNode must have a provided MassTag' );
-
     assert && assert( !massTag.nameProperty.isDisposed, 'do not dispose a nameProperty' );
 
     const visibleProperty = new DerivedProperty( [ massTag.nameProperty ], name => name.length > 0 );
@@ -68,7 +67,6 @@ export default class MassTagNode extends Node {
       visibleProperty.dispose();
       backgroundNode.dispose();
     } );
-
   }
 }
 
diff --git a/js/common/view/MassView.ts b/js/common/view/MassView.ts
index 711ff6f9..1f5024b5 100644
--- a/js/common/view/MassView.ts
+++ b/js/common/view/MassView.ts
@@ -28,7 +28,6 @@ const INVERT_Y_TRANSFORM = ModelViewTransform2.createSinglePointScaleInvertedYMa
 
 export default abstract class MassView extends Disposable {
 
-  public readonly mass: Mass;
   public readonly massMesh: MassThreeMesh;
 
   private readonly positionListener: () => void;
@@ -39,15 +38,14 @@ export default abstract class MassView extends Disposable {
   public readonly focusablePath: Path | null;
   public readonly focusableShapeProperty = new Property( new Shape() );
 
-  protected constructor( mass: Mass, initialGeometry: THREE.BufferGeometry,
+  protected constructor( public readonly mass: Mass,
+                         initialGeometry: THREE.BufferGeometry,
                          protected readonly modelViewTransform: THREEModelViewTransform ) {
 
     super();
 
-    this.mass = mass;
     this.massMesh = new MassThreeMesh( mass, initialGeometry );
 
-
     const repositionMassTagNode = () => {
       assert && assert( this.massTagNode, 'do not reposition massTagNode if you do not have a massTag' );
       this.massTagNode!.translation = modelViewTransform.modelToViewPoint( mass.matrix.translation.toVector3().plus( this.tagOffsetProperty.value ).plusXYZ( 0, 0, 0.0001 ) );
diff --git a/js/common/view/MaterialControlNode.ts b/js/common/view/MaterialControlNode.ts
index 2d3f6aeb..36898f41 100644
--- a/js/common/view/MaterialControlNode.ts
+++ b/js/common/view/MaterialControlNode.ts
@@ -47,7 +47,6 @@ export default class MaterialControlNode extends VBox {
                       listParent: Node,
                       providedOptions: MaterialControlNodeOptions ) {
 
-
     const options = optionize<MaterialControlNodeOptions, SelfMaterialControlNodeOptions, VBoxOptions>()( {
       syncCustomMaterialDensity: true,
       ownsCustomDensityRange: true,
diff --git a/js/common/view/MaterialMassVolumeControlNode.ts b/js/common/view/MaterialMassVolumeControlNode.ts
index 639b1bd2..f6bc7588 100644
--- a/js/common/view/MaterialMassVolumeControlNode.ts
+++ b/js/common/view/MaterialMassVolumeControlNode.ts
@@ -81,6 +81,8 @@ export default class MaterialMassVolumeControlNode extends MaterialControlNode {
                       materials: Material[],
                       setVolume: ( volume: number ) => void,
                       listParent: Node,
+
+                      // TODO: Remove unused, see https://github.com/phetsims/density-buoyancy-common/issues/123
                       numberControlMassPropertyFeatured: boolean,
                       providedOptions: MaterialMassVolumeControlNodeOptions ) {
 
@@ -105,6 +107,7 @@ export default class MaterialMassVolumeControlNode extends MaterialControlNode {
     assert && assert( options.minVolumeLiters <= options.minCustomVolumeLiters, 'This seems to be a requirement, I hope you never hit this' );
 
     // If we will be creating a high density mass NumberControl in addition to the normal one.
+    // TODO: Change from !! to !== null ? Since it has different semantics for 0 which is numeric but falsy. See https://github.com/phetsims/density-buoyancy-common/issues/123
     const supportTwoMassNumberControls = !!options.highDensityMaxMass;
 
     // Mass-related elements should not be instrumented if showing as a Density control instead of Mass control.
@@ -175,6 +178,7 @@ export default class MaterialMassVolumeControlNode extends MaterialControlNode {
       units: 'L'
     } );
 
+    // TODO: Document the purpose of this lazyLink, see https://github.com/phetsims/density-buoyancy-common/issues/257
     // This instance lives for the lifetime of the simulation, so we don't need to remove this listener
     numberControlVolumeProperty.lazyLink( liters => {
       if ( !modelVolumeChanging && !userMassChanging ) {
@@ -192,12 +196,13 @@ export default class MaterialMassVolumeControlNode extends MaterialControlNode {
       }
     } );
 
+    // TODO: Document the purpose of this lazyLink, see https://github.com/phetsims/density-buoyancy-common/issues/257
     // This instance lives for the lifetime of the simulation, so we don't need to remove this listener
     volumeProperty.lazyLink( cubicMeters => {
       if ( !userVolumeChanging ) {
         modelVolumeChanging = true;
 
-        // If the value is close to min/max, massage it to the exact value, see https://github.com/phetsims/density/issues/46
+        // If the value is close to min/max, set it to the exact min/max, see https://github.com/phetsims/density/issues/46
         let volumeLiters = cubicMeters * LITERS_IN_CUBIC_METER;
         if ( volumeLiters > options.minVolumeLiters && volumeLiters < options.minVolumeLiters + 1e-10 ) {
           volumeLiters = options.minVolumeLiters;
@@ -212,6 +217,7 @@ export default class MaterialMassVolumeControlNode extends MaterialControlNode {
       }
     } );
 
+    // TODO: Document the purpose of this lazyLink, see https://github.com/phetsims/density-buoyancy-common/issues/257
     // This instance lives for the lifetime of the simulation, so we don't need to remove this listener
     numberControlMassProperty.lazyLink( mass => {
       if ( !modelMassChanging && !userVolumeChanging ) {
@@ -231,6 +237,7 @@ export default class MaterialMassVolumeControlNode extends MaterialControlNode {
       }
     } );
 
+    // TODO: Document the purpose of this lazyLink, see https://github.com/phetsims/density-buoyancy-common/issues/257
     // This instance lives for the lifetime of the simulation, so we don't need to remove this listener
     massProperty.lazyLink( mass => {
       if ( !userMassChanging ) {
@@ -479,6 +486,8 @@ const getMassReadoutLayoutFunction = ( normalLayoutFunction: LayoutFunction ) =>
   return ( titleNode: Node, numberDisplay: NumberDisplay, slider: Slider, decrementButton: ArrowButton | null, incrementButton: ArrowButton | null ) => {
     const tempNode = normalLayoutFunction( titleNode, numberDisplay, slider, decrementButton, incrementButton );
     const width = tempNode.width;
+
+    // TODO: Safe to dispose the parent before detaching the children? See https://github.com/phetsims/density-buoyancy-common/issues/123
     tempNode.dispose();
     titleNode.detach();
     numberDisplay.detach();
diff --git a/js/common/view/MaterialView.ts b/js/common/view/MaterialView.ts
index 542311e5..c23994dd 100644
--- a/js/common/view/MaterialView.ts
+++ b/js/common/view/MaterialView.ts
@@ -53,15 +53,9 @@ import densityBuoyancyCommon from '../../densityBuoyancyCommon.js';
 import Material from '../model/Material.js';
 import ReadOnlyProperty from '../../../../axon/js/ReadOnlyProperty.js';
 
-// MaterialView definition
-
 class MaterialView<T extends THREE.Material = THREE.Material> {
 
-  public readonly material: T;
-
-  public constructor( material: T ) {
-    this.material = material;
-  }
+  public constructor( public readonly material: T ) { }
 
   /**
    * Releases references
@@ -71,7 +65,6 @@ class MaterialView<T extends THREE.Material = THREE.Material> {
   }
 }
 
-
 // constants
 
 function toWrappedTexture( image: HTMLImageElement ): THREE.Texture {
diff --git a/js/common/view/PoolScaleHeightControl.ts b/js/common/view/PoolScaleHeightControl.ts
index 62a2ffe2..a9580462 100644
--- a/js/common/view/PoolScaleHeightControl.ts
+++ b/js/common/view/PoolScaleHeightControl.ts
@@ -72,6 +72,8 @@ export default class PoolScaleHeightControl extends NumberControl {
         // NumberControl does not support accessibleName, so we pass the tandem name of the NumberControl to the slider
         accessibleName: Tandem.toAccessibleName( providedOptions, 'Control' )
       },
+
+      // TODO: Aren't these optional by default? Can we omit the OPT_OUT? See https://github.com/phetsims/density-buoyancy-common/issues/123
       titleNodeOptions: { tandem: Tandem.OPT_OUT },
       numberDisplayOptions: { tandem: Tandem.OPT_OUT },
       delta: DEFAULT_RANGE.getLength() / 2000,
diff --git a/js/common/view/PrecisionSliderThumb.ts b/js/common/view/PrecisionSliderThumb.ts
index 1ef9c316..6f1210ec 100644
--- a/js/common/view/PrecisionSliderThumb.ts
+++ b/js/common/view/PrecisionSliderThumb.ts
@@ -62,7 +62,6 @@ export default class PrecisionSliderThumb extends Node {
 
     super( options );
 
-
     // highlight thumb on pointer over
     const pressListener = new PressListener( {
       attach: false,
diff --git a/js/common/view/ScaleReadoutNode.ts b/js/common/view/ScaleReadoutNode.ts
index e162138f..e3d5bee0 100644
--- a/js/common/view/ScaleReadoutNode.ts
+++ b/js/common/view/ScaleReadoutNode.ts
@@ -2,6 +2,7 @@
 
 /**
  * Shows a readout in front of a scale, for its measured mass/weight.
+ * Not dependent on a Scale model instance.
  *
  * @author Jonathan Olson (PhET Interactive Simulations)
  */
@@ -27,7 +28,6 @@ type GeneralScaleReadoutNodeSelfOptions = {
 };
 type GeneralScaleReadoutNodeOptions = NodeOptions & GeneralScaleReadoutNodeSelfOptions;
 
-// Not dependent on a Scale model instance.
 export class GeneralScaleReadoutNode extends Node {
 
   private readonly stringProperty: TReadOnlyProperty<string>;
@@ -91,18 +91,17 @@ export class GeneralScaleReadoutNode extends Node {
   }
 }
 
+// TODO: https://github.com/phetsims/density-buoyancy-common/issues/257 document how this differs from GeneralScaleReadoutNode
+// TODO: How can a client choose which one they need? See https://github.com/phetsims/density-buoyancy-common/issues/257
 export default class ScaleReadoutNode extends GeneralScaleReadoutNode {
 
-  public readonly mass: Scale;
-
-  public constructor( mass: Scale, gravityProperty: TReadOnlyProperty<Gravity> ) {
+  // TODO: Rename mass => scale, see https://github.com/phetsims/density-buoyancy-common/issues/123
+  public constructor( public readonly mass: Scale, gravityProperty: TReadOnlyProperty<Gravity> ) {
 
     const blendedProperty = new BlendedNumberProperty( mass.measuredWeightInterpolatedProperty.value );
     mass.stepEmitter.addListener( () => blendedProperty.step( mass.measuredWeightInterpolatedProperty.value ) );
 
     super( blendedProperty, gravityProperty, mass.displayType );
-
-    this.mass = mass;
   }
 }
 
diff --git a/js/common/view/VolumeUnitsControl.ts b/js/common/view/VolumeUnitsControl.ts
index 1fb1f4f6..bb1d6388 100644
--- a/js/common/view/VolumeUnitsControl.ts
+++ b/js/common/view/VolumeUnitsControl.ts
@@ -52,6 +52,7 @@ export default class VolumeUnitsControl extends HBox {
     };
   }
 
+  // TODO: Are preference controls ever disposed? https://github.com/phetsims/density-buoyancy-common/issues/123
   public override dispose(): void {
     super.dispose();
     this.disposeVolumeUnitsControl();
diff --git a/js/density/view/DensityIntroScreenView.ts b/js/density/view/DensityIntroScreenView.ts
index ffdf7415..ae05dbe1 100644
--- a/js/density/view/DensityIntroScreenView.ts
+++ b/js/density/view/DensityIntroScreenView.ts
@@ -71,7 +71,6 @@ export default class DensityIntroScreenView extends DensityBuoyancyScreenView<De
     } );
     const densityAccordionBox = new AccordionBox( new DensityNumberLineNode( {
         displayDensities: [
-          // DerivedProperty doesn't need disposal, since everything here lives for the lifetime of the simulation
           {
             densityProperty: model.massA.materialProperty.densityProperty,
             nameProperty: model.massA.tag.nameProperty,
@@ -118,6 +117,7 @@ export default class DensityIntroScreenView extends DensityBuoyancyScreenView<De
 
     // DerivedProperty doesn't need disposal, since everything here lives for the lifetime of the simulation
     this.rightBarrierViewPointPropertyProperty.value = new DerivedProperty( [ this.rightBox.boundsProperty, this.visibleBoundsProperty ], ( boxBounds, visibleBounds ) => {
+
       // We might not have a box, see https://github.com/phetsims/density/issues/110
       return new Vector2( isFinite( boxBounds.left ) ? boxBounds.left : visibleBounds.right, visibleBounds.centerY );
     } );
@@ -132,6 +132,7 @@ export default class DensityIntroScreenView extends DensityBuoyancyScreenView<De
     this.addChild( this.popupLayer );
 
     // Layer for the focusable masses. Must be in the scene graph, so they can populate the pdom order
+    // TODO: Is it important to say pdomOrder:[] here? If so, document why. If not, remove it. https://github.com/phetsims/density-buoyancy-common/issues/123
     const cubeALayer = new Node( { pdomOrder: [] } );
     this.addChild( cubeALayer );
     const cubeBLayer = new Node( { pdomOrder: [] } );
diff --git a/js/density/view/DensityNumberLineNode.ts b/js/density/view/DensityNumberLineNode.ts
index 941c8f8e..cb86a7f6 100644
--- a/js/density/view/DensityNumberLineNode.ts
+++ b/js/density/view/DensityNumberLineNode.ts
@@ -94,11 +94,11 @@ export type DensityNumberLineNodeOptions = SelfOptions & NodeOptions;
 export default class DensityNumberLineNode extends Node {
 
   private readonly modelViewTransform: ( density: number ) => number;
-
   private markerNodes: Node[] = [];
 
   public constructor( providedOptions?: DensityNumberLineNodeOptions ) {
 
+    // TODO: DensityNumberLineNode only has one instantiation site, so why are things like materials in the defaults? See https://github.com/phetsims/density-buoyancy-common/issues/123
     const options = optionize<DensityNumberLineNodeOptions, SelfOptions, NodeOptions>()( {
       materials: [
         Material.HUMAN,
@@ -227,6 +227,8 @@ export default class DensityNumberLineNode extends Node {
         isHiddenProperty
       ], ( density, isVisible, isHidden ) => {
         marker.x = this.modelViewTransform( density );
+
+        // TODO: what is undefined + 1E-5? (Hint: it is NaN). Is that a good way to do this? See https://github.com/phetsims/density-buoyancy-common/issues/257
         marker.visible = isVisible && !isHidden && density < options.maxDensity! + 1e-5;
       } );
     } );