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: Throughout the whole series, Oggy's house contains various disproportional rooms inside of it. For example, the living room inside of the house is literally twice the size of the house alone. What's hilarious is that Oggy used the living room only to watch TV.