These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Nightmare Fuel: A few of the other creatures they've met, such as the "Bassasaurus Rex" mentioned in the main entry, and Kaschei the ogre from Firebird Rescue. Although he's part of the art theme in the episode, thus not making Little Einsteins totally to blame, the king from "Go Team!!" may also qualify. *shudders*