Insect Inside / Powerpuff Bluff - S1-E1
Trivia: In "Powerpuff Bluff", Dexter makes a cameo appearance when the kindergarten kids have a nap time.
Trivia: During the Pokérap that appears after some episodes, nearly all of the Pokémon shown are the actual creatures, but Venusaur, Charizard, Blastoise, Rhydon, Zapdos, and Kabutops that are shown are machines from Pokémon Island. Also, when Kabuto is shown, it isn't actually a Kabuto but Bill in Kabuto's costume.
Trivia: The episode starts off with Dee Dee eating scraps, while Marky looks over stuff. Later on, Marky found what seems to be an Identity Card that belongs to Joey. Here, the card shows that Joey's birthday is on June 15th, 1991. (00:00:14)
Suggested correction: Is there some sort of special offscreen significance to this birthday? Because I don't see how this constitutes trivia if it's blatantly shown onscreen.