Phantom Mangle is the only phantom animatronic in the game to not appear on the Extra menu. This is likely due to the fact that no "complete" images of Phantom Mangle exist; its appearance in The Office is only a disembodied head, and its appearance on CAM 04 is drastically cropped.
The "Happiest Day" minigame is the only extra minigame which doesn't appear in the Extra Menu.
In the mobile version, the Extra Menu doesn't feature minigames and jumpscares.
In a comment on the YouTuber Markiplier's video in which he beat Nightmare with the Aggressive cheat enabled, Scott Cawthon stated that he did not know if the mode was possible. He later added a fourth star for beating the night.