* ActingForTwo: George Lowe voices Dad and Space Ghost in the episode when Space Ghost visits.
* NonSingingVoice: Played for laughs in ''Psychoklahoma'' in which Zorak is revealed to have a [[https://www.youtube.com/watch?v=DEMKb5d_pSI beautiful, boy band-like singing voice]] that is totally unlike his normal voice.
* TheOtherDarrin: Mom was voiced by Marsha Crenshaw in season 1 and early Season 2 and later voiced by Joanna Daniel from season 2 onwards. Lampshaded when both Moms appear [[ItMakesSenseInContext as penguins]] in the finale, arguing over who was the better one.
* ThrowItIn: Dad was originally meant to be of average height. A mistake when compositing a scene made him much smaller than everything else around him, and it was just deemed funnier to have him be comically tiny compared to nearly every other character in the show.
* WhatCouldHaveBeen: At one time the series was in development for Cartoon Network, instead of Adult Swim.
** The crew also considered expanding on the variety show format before the idea to make it a sitcom.
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