Still acting pretty much the same at any age despite getting younger and younger.
Dance Party Fridays.
Keswick said that after someone gets hit by the Young Gun they age backwards until they disappear, yet Old Lady Metzger still didn't continue to age backwards after being hit by the gun and she still stayed as a young adult.
Keswick said that his species looks like jellyfish when they get old, yet in The Doomies when his parents are seen they don't look like jellyfish at all and resemble older versions of his current appearance.
Kitty as a baby looked different from her baby pictures in Doom-Mates.
Snaptrap is able to eat yogurt even though he has cheese allergy. Though it might be something that is in the cheese and not the yogurt. Same thing that's happened in The Wrong Stuff and Iron Mutt.