Within the Beta 8 of Sonic the Hedgehog 4: Episode II, along with a "To Be Continued" text, there is a short track that belongs to a cutscene within the game. The cutscene is named Cutscene 9C while the final cutscene of the game (where Sonic and Tails leave the exploding Death Egg mk.II Zone) is named Cutscene 9A. No reassons are known why the cutscene has been unused.
When pressing the "0" or "LT" button in the Beta 8 version of Sonic the Hedgehog 4: Episode II, the player automatically gains 99 Rings. This only works if there is no other input from the player when the button is pressed and does not work in the Special Stages. This was disabled by the game's target release date and is likely a debug command for testing purposes.