diff --git a/programs/mpl-core/src/plugins/lifecycle.rs b/programs/mpl-core/src/plugins/lifecycle.rs
index e8b0461a..84998626 100644
--- a/programs/mpl-core/src/plugins/lifecycle.rs
+++ b/programs/mpl-core/src/plugins/lifecycle.rs
@@ -49,7 +49,7 @@ impl ExternalCheckResult {
 
 /// Bitfield representation of lifecycle permissions for external plugin adapter, third party plugins.
 #[bitfield(bits = 32)]
-#[derive(Eq, PartialEq, Copy, Clone, Debug)]
+#[derive(Eq, PartialEq, Copy, Clone, Debug, Default)]
 pub struct ExternalCheckResultBits {
     pub can_listen: bool,
     pub can_approve: bool,
@@ -1016,22 +1016,6 @@ pub(crate) trait PluginValidation {
         abstain!()
     }
 
-    /// Validate the add_authority lifecycle action.
-    fn validate_add_authority(
-        &self,
-        _ctx: &PluginValidationContext,
-    ) -> Result<ValidationResult, ProgramError> {
-        abstain!()
-    }
-
-    /// Validate the add_authority lifecycle action.
-    fn validate_remove_authority(
-        &self,
-        _ctx: &PluginValidationContext,
-    ) -> Result<ValidationResult, ProgramError> {
-        abstain!()
-    }
-
     /// Validate the update_plugin lifecycle action.
     fn validate_update_external_plugin_adapter(
         &self,
diff --git a/programs/mpl-core/src/plugins/plugin_registry.rs b/programs/mpl-core/src/plugins/plugin_registry.rs
index e2c9f6cd..24730269 100644
--- a/programs/mpl-core/src/plugins/plugin_registry.rs
+++ b/programs/mpl-core/src/plugins/plugin_registry.rs
@@ -134,13 +134,15 @@ impl ExternalRegistryRecord {
             ExternalPluginAdapterUpdateInfo::LifecycleHook(update_info) => {
                 if let Some(checks) = &update_info.lifecycle_checks {
                     validate_lifecycle_checks(checks, false)?;
-                    self.lifecycle_checks = update_info.lifecycle_checks.clone()
+                    self.lifecycle_checks
+                        .clone_from(&update_info.lifecycle_checks)
                 }
             }
             ExternalPluginAdapterUpdateInfo::Oracle(update_info) => {
                 if let Some(checks) = &update_info.lifecycle_checks {
                     validate_lifecycle_checks(checks, true)?;
-                    self.lifecycle_checks = update_info.lifecycle_checks.clone()
+                    self.lifecycle_checks
+                        .clone_from(&update_info.lifecycle_checks)
                 }
             }
             _ => (),
diff --git a/programs/mpl-core/src/plugins/utils.rs b/programs/mpl-core/src/plugins/utils.rs
index d124862f..a0dd8543 100644
--- a/programs/mpl-core/src/plugins/utils.rs
+++ b/programs/mpl-core/src/plugins/utils.rs
@@ -413,7 +413,7 @@ pub fn initialize_external_plugin_adapter<'a, T: DataBlob + SolanaAccount>(
 }
 
 pub(crate) fn validate_lifecycle_checks(
-    lifecycle_checks: &Vec<(HookableLifecycleEvent, ExternalCheckResult)>,
+    lifecycle_checks: &[(HookableLifecycleEvent, ExternalCheckResult)],
     can_reject_only: bool,
 ) -> ProgramResult {
     if lifecycle_checks.is_empty() {
diff --git a/programs/mpl-core/src/processor/burn.rs b/programs/mpl-core/src/processor/burn.rs
index 98dae2c1..0a125d3f 100644
--- a/programs/mpl-core/src/processor/burn.rs
+++ b/programs/mpl-core/src/processor/burn.rs
@@ -9,7 +9,7 @@ use crate::{
     state::{AssetV1, CollectionV1, CompressionProof, Key, SolanaAccount, Wrappable},
     utils::{
         close_program_account, load_key, rebuild_account_state_from_proof_data, resolve_authority,
-        validate_asset_permissions, validate_collection_permissions, verify_proof,
+        validate_asset_permissions, verify_proof,
     },
 };