* EarWorm: Many of the Karaoke Cafe songs are quite catchy, the prime contenders being "Picking Up The Pieces When Your Whole World Falls Apart" and "Everybody Bump" (a slight reworking of the show's theme song).
* EnsembleDarkhorse: The Germ Girl from "Adventures in Microbia" is very popular even though she's a minor character. It helps that she's voiced by E.G. Daily.
* HilariousInHindsight: Creator/JaniceKawaye guest-starred in two episodes as Little Robot. Years later, she'd be known better for playing [=XJ9=]/Jenny, the titular character of ''WesternAnimation/MyLifeAsATeenageRobot''.
** Molly Coddle and Germ Girl both manage to be somewhat endearing in spite of their weird appearances.
** The Closet Monster also has his moments of being adorable in spite of being hideous.
* TheWoobie: Squishington is sometimes this, one particular example being in the Christmas special when he feels depressed over his inability to tap dance due to his lack of feet.