Gimmick! EXACT☆MIX considerably ages up Yumetaro's owner compared to the original Mr. Gimmick, giving her a visibly adult appearance despite still filling the role of a small child. In light of this, the game's cutscenes feature an Easter egg where, while being teleported, the girl's clothes briefly disappear for a few frames, followed by her lingerie.

In Gimmick! 2, this retcon would be undone, re-establishing the girl as having been a child during the events of the first game, and setting up a time skip where she has become an adult and Yumetaro has been passed down to her daughter.

The original release of the game in both Japan and Scandinavia contains a track in the sound test called "Strange Memories of Death". This song is not featured anywhere else in the game, implying that whatever purpose it was written for was discarded during development. The arcade remake, Gimmick! EXACT☆MIX, would finally incorporate the song for the new continue screen.

In Gimmick: Exact Mix, a black bird ally from the original game was recolored to resemble Kyorochan, the mascot of ChocoBall, a Japanese malt chocolate ball brand similar to Maltesers or Whoppers.