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 voice of Onizuka in the English dub of the series is provided by Steve Blum. However, he had to use an alias ("David Lucas") due to the show being a non-union job. Blum has since jokingly denied that he and Lucas are the same person, despite it being a well-known fact that they are.