- Absentee Actor: King Dedede doesn't appear anywhere at all, not even as a cameo appearance. This fact gets referenced at the very end of his own game mode in Kirby: Triple Deluxe, where he enters the Mirror World to face and defeat Dark Meta Knight as his Final Boss. Also of note is how Triple Deluxe's 2014 release also marks the 10th anniversary of Amazing Mirror's 2004 release.
- What Could Have Been: Kirby's normal form and all of his Copy Abilities have Flavor Text when the game is paused, but Dummied Out of a prototype build is one for when he dies◊, and shows a drawing of him in a puddle of blood. It was likely removed because the game can't normally be paused during Kirby's Death Throws, though this doesn't apply to the prototype demo.
Trivia / Kirby & the Amazing Mirror