diff --git a/flytekit/clis/helpers.py b/flytekit/clis/helpers.py
index 73274e972e..d922f5e3c1 100644
--- a/flytekit/clis/helpers.py
+++ b/flytekit/clis/helpers.py
@@ -1,5 +1,7 @@
+import sys
 from typing import Tuple, Union
 
+import click
 from flyteidl.admin.launch_plan_pb2 import LaunchPlan
 from flyteidl.admin.task_pb2 import TaskSpec
 from flyteidl.admin.workflow_pb2 import WorkflowSpec
@@ -125,3 +127,9 @@ def hydrate_registration_parameters(
     del entity.sub_workflows[:]
     entity.sub_workflows.extend(refreshed_sub_workflows)
     return identifier, entity
+
+
+def display_help_with_error(ctx: click.Context, message: str):
+    click.echo(f"{ctx.get_help()}\n")
+    click.secho(message, fg="red")
+    sys.exit(1)
diff --git a/flytekit/clis/sdk_in_container/package.py b/flytekit/clis/sdk_in_container/package.py
index 71efeab576..2a884e29da 100644
--- a/flytekit/clis/sdk_in_container/package.py
+++ b/flytekit/clis/sdk_in_container/package.py
@@ -1,8 +1,8 @@
 import os
-import sys
 
 import click
 
+from flytekit.clis.helpers import display_help_with_error
 from flytekit.clis.sdk_in_container import constants
 from flytekit.configuration import (
     DEFAULT_RUNTIME_PYTHON_INTERPRETER,
@@ -100,8 +100,7 @@ def package(ctx, image_config, source, output, force, fast, in_container_source_
 
     pkgs = ctx.obj[constants.CTX_PACKAGES]
     if not pkgs:
-        click.secho("No packages to scan for flyte entities. Aborting!", fg="red")
-        sys.exit(-1)
+        display_help_with_error(ctx, "No packages to scan for flyte entities. Aborting!")
 
     try:
         serialize_and_package(pkgs, serialization_settings, source, output, fast)
diff --git a/flytekit/clis/sdk_in_container/register.py b/flytekit/clis/sdk_in_container/register.py
index 8a3be2dfa6..03e00d7896 100644
--- a/flytekit/clis/sdk_in_container/register.py
+++ b/flytekit/clis/sdk_in_container/register.py
@@ -1,10 +1,10 @@
 import os
 import pathlib
-import sys
 import typing
 
 import click
 
+from flytekit.clis.helpers import display_help_with_error
 from flytekit.clis.sdk_in_container import constants
 from flytekit.clis.sdk_in_container.helpers import get_and_save_remote_with_click_context
 from flytekit.configuration import FastSerializationSettings, ImageConfig, SerializationSettings
@@ -67,7 +67,7 @@
     "--output",
     required=False,
     type=click.Path(dir_okay=True, file_okay=False, writable=True, resolve_path=True),
-    default=".",
+    default=None,
     help="Directory to write the output zip file containing the protobuf definitions",
 )
 @click.option(
@@ -122,6 +122,12 @@ def register(
     if pkgs:
         raise ValueError("Unimplemented, just specify pkgs like folder/files as args at the end of the command")
 
+    if len(package_or_module) == 0:
+        display_help_with_error(
+            ctx,
+            "Missing argument 'PACKAGE_OR_MODULE...', at least one PACKAGE_OR_MODULE is required but multiple can be passed",
+        )
+
     cli_logger.debug(
         f"Running pyflyte register from {os.getcwd()} "
         f"with images {image_config} "
@@ -162,8 +168,7 @@ def register(
         serialization_settings, detected_root, list(package_or_module), options
     )
     if len(registerable_entities) == 0:
-        click.secho("No Flyte entities were detected. Aborting!", fg="red")
-        sys.exit(1)
+        display_help_with_error(ctx, "No Flyte entities were detected. Aborting!")
     cli_logger.info(f"Found and serialized {len(registerable_entities)} entities")
 
     if not version:
diff --git a/flytekit/tools/fast_registration.py b/flytekit/tools/fast_registration.py
index f38c3803a1..c4ac31a01a 100644
--- a/flytekit/tools/fast_registration.py
+++ b/flytekit/tools/fast_registration.py
@@ -9,6 +9,8 @@
 import tempfile
 from typing import Optional
 
+import click
+
 from flytekit.core.context_manager import FlyteContextManager
 from flytekit.tools.ignore import DockerIgnore, GitIgnore, IgnoreGroup, StandardIgnore
 from flytekit.tools.script_mode import tar_strip_file_attributes
@@ -31,8 +33,11 @@ def fast_package(source: os.PathLike, output_dir: os.PathLike) -> os.PathLike:
     digest = compute_digest(source, ignore.is_ignored)
     archive_fname = f"{FAST_PREFIX}{digest}{FAST_FILEENDING}"
 
-    if output_dir:
-        archive_fname = os.path.join(output_dir, archive_fname)
+    if output_dir is None:
+        output_dir = tempfile.mkdtemp()
+        click.secho(f"Output given as {None}, using a temporary directory at {output_dir} instead", fg="yellow")
+
+    archive_fname = os.path.join(output_dir, archive_fname)
 
     with tempfile.TemporaryDirectory() as tmp_dir:
         tar_path = os.path.join(tmp_dir, "tmp.tar")
diff --git a/flytekit/tools/repo.py b/flytekit/tools/repo.py
index ad07ea2111..167c772184 100644
--- a/flytekit/tools/repo.py
+++ b/flytekit/tools/repo.py
@@ -91,6 +91,10 @@ def package(
 
         # If Fast serialization is enabled, then an archive is also created and packaged
         if fast:
+            # If output exists and is a path within source, delete it so as to not re-bundle it again.
+            if os.path.abspath(output).startswith(os.path.abspath(source)) and os.path.exists(output):
+                click.secho(f"{output} already exists within {source}, deleting and re-creating it", fg="yellow")
+                os.remove(output)
             archive_fname = fast_registration.fast_package(source, output_tmpdir)
             click.secho(f"Fast mode enabled: compressed archive {archive_fname}", dim=True)
 
diff --git a/tests/flytekit/unit/cli/pyflyte/conftest.py b/tests/flytekit/unit/cli/pyflyte/conftest.py
index 723fb4878b..6ce51bd4e1 100644
--- a/tests/flytekit/unit/cli/pyflyte/conftest.py
+++ b/tests/flytekit/unit/cli/pyflyte/conftest.py
@@ -18,7 +18,7 @@ def _fake_module_load(names):
     yield simple
 
 
-@pytest.yield_fixture(
+@pytest.fixture(
     scope="function",
     params=[
         os.path.join(
diff --git a/tests/flytekit/unit/cli/pyflyte/test_package.py b/tests/flytekit/unit/cli/pyflyte/test_package.py
index d31b760608..364b6b14d9 100644
--- a/tests/flytekit/unit/cli/pyflyte/test_package.py
+++ b/tests/flytekit/unit/cli/pyflyte/test_package.py
@@ -1,3 +1,6 @@
+import os
+import shutil
+
 import pytest
 from click.testing import CliRunner
 from flyteidl.admin.launch_plan_pb2 import LaunchPlan
@@ -11,6 +14,22 @@
 from flytekit.core import context_manager
 from flytekit.exceptions.user import FlyteValidationException
 
+sample_file_contents = """
+from flytekit import task, workflow
+
+@task(cache=True, cache_version="1", retries=3)
+def sum(x: int, y: int) -> int:
+    return x + y
+
+@task(cache=True, cache_version="1", retries=3)
+def square(z: int) -> int:
+    return z*z
+
+@workflow
+def my_workflow(x: int, y: int) -> int:
+    return sum(x=square(z=x), y=square(z=y))
+"""
+
 
 @flytekit.task
 def foo():
@@ -44,6 +63,29 @@ def test_get_registrable_entities():
         assert False, f"found unknown entity {type(e)}"
 
 
+def test_package_with_fast_registration():
+    runner = CliRunner()
+    with runner.isolated_filesystem():
+        os.makedirs("core", exist_ok=True)
+        with open(os.path.join("core", "sample.py"), "w") as f:
+            f.write(sample_file_contents)
+            f.close()
+        result = runner.invoke(pyflyte.main, ["--pkgs", "core", "package", "--image", "core:v1", "--fast"])
+        assert result.exit_code == 0
+        assert "Successfully serialized" in result.output
+        assert "Successfully packaged" in result.output
+        result = runner.invoke(pyflyte.main, ["--pkgs", "core", "package", "--image", "core:v1", "--fast"])
+        assert result.exit_code == 2
+        assert "flyte-package.tgz already exists, specify -f to override" in result.output
+        result = runner.invoke(
+            pyflyte.main,
+            ["--pkgs", "core", "package", "--image", "core:v1", "--fast", "--force"],
+        )
+        assert result.exit_code == 0
+        assert "deleting and re-creating it" in result.output
+        shutil.rmtree("core")
+
+
 def test_duplicate_registrable_entities():
     @flytekit.task
     def t_1():
@@ -114,3 +156,11 @@ def test_package():
 def test_pkgs():
     pp = pyflyte.validate_package(None, None, ["a.b", "a.c,b.a", "cc.a"])
     assert pp == ["a.b", "a.c", "b.a", "cc.a"]
+
+
+def test_package_with_no_pkgs():
+    runner = CliRunner()
+    with runner.isolated_filesystem():
+        result = runner.invoke(pyflyte.main, ["package"])
+        assert result.exit_code == 1
+        assert "No packages to scan for flyte entities. Aborting!" in result.output
diff --git a/tests/flytekit/unit/cli/pyflyte/test_register.py b/tests/flytekit/unit/cli/pyflyte/test_register.py
index 52bf13d0a6..d078851e1b 100644
--- a/tests/flytekit/unit/cli/pyflyte/test_register.py
+++ b/tests/flytekit/unit/cli/pyflyte/test_register.py
@@ -1,6 +1,30 @@
+import os
+import shutil
+import subprocess
+
 import mock
+from click.testing import CliRunner
 
+from flytekit.clients.friendly import SynchronousFlyteClient
+from flytekit.clis.sdk_in_container import pyflyte
 from flytekit.clis.sdk_in_container.helpers import get_and_save_remote_with_click_context
+from flytekit.remote.remote import FlyteRemote
+
+sample_file_contents = """
+from flytekit import task, workflow
+
+@task(cache=True, cache_version="1", retries=3)
+def sum(x: int, y: int) -> int:
+    return x + y
+
+@task(cache=True, cache_version="1", retries=3)
+def square(z: int) -> int:
+    return z*z
+
+@workflow
+def my_workflow(x: int, y: int) -> int:
+    return sum(x=square(z=x), y=square(z=y))
+"""
 
 
 @mock.patch("flytekit.clis.sdk_in_container.helpers.FlyteRemote")
@@ -9,3 +33,33 @@ def test_saving_remote(mock_remote):
     mock_context.obj = {}
     get_and_save_remote_with_click_context(mock_context, "p", "d")
     assert mock_context.obj["flyte_remote"] is not None
+
+
+def test_register_with_no_package_or_module_argument():
+    runner = CliRunner()
+    with runner.isolated_filesystem():
+        result = runner.invoke(pyflyte.main, ["register"])
+        assert result.exit_code == 1
+        assert (
+            "Missing argument 'PACKAGE_OR_MODULE...', at least one PACKAGE_OR_MODULE is required but multiple can be passed"
+            in result.output
+        )
+
+
+@mock.patch("flytekit.clis.sdk_in_container.helpers.FlyteRemote", spec=FlyteRemote)
+@mock.patch("flytekit.clients.friendly.SynchronousFlyteClient", spec=SynchronousFlyteClient)
+def test_register_with_no_output_dir_passed(mock_client, mock_remote):
+    mock_remote._client = mock_client
+    mock_remote.return_value._version_from_hash.return_value = "dummy_version_from_hash"
+    mock_remote.return_value._upload_file.return_value = "dummy_md5_bytes", "dummy_native_url"
+    runner = CliRunner()
+    with runner.isolated_filesystem():
+        out = subprocess.run(["git", "init"], capture_output=True)
+        assert out.returncode == 0
+        os.makedirs("core", exist_ok=True)
+        with open(os.path.join("core", "sample.py"), "w") as f:
+            f.write(sample_file_contents)
+            f.close()
+        result = runner.invoke(pyflyte.main, ["register", "core"])
+        assert "Output given as None, using a temporary directory at" in result.output
+        shutil.rmtree("core")