Other mistake: In this episode, they have a leak in the roof. Yet, the house is a two story house with an attic. So it should not be able to leak into the living room. Also, when Carl and Eddie go up to fix the roof, Eddie falls through the roof and ends up on the living room couch. Again, two story house with attic. Should not happen.
Other mistake: On the "Mario's Greatest Movie Moments" DVD of this series, from the main menu, go into the trivia game. The fifth question asks you about the Super Mario Bros. Super Show episode 'Count Koopula.' It asks you "What's room number that the Mario Bros. were put into in Koopula's Castle?" It's supposed to say "What's THE room number that the Mario Bros. were put into in Koopula's Castle?"
Other mistake: Spryte kisses Frog Link which breaks the spell and turns him back into an elf. As this happens, bright blue light shines off him and you see a shot of Ganon and Zelda, Ganon's back to Link and Zelda in front of Ganon facing towards Link. When the light starts, it shines from the left side of the screen and you see it hitting Ganon correctly, lighting up parts of his body from the left. But the light is oddly hitting Zelda from the right, which doesn't match up. (00:13:25)
Other mistake: In the scene where the Glee Club is discussing that Violet will win them the contest, Violet leaves as she is upset about Screech. Zack then comments about "No one having a voice like Violet's". If you look at Mr. Tuttle, he mouths the words that Zack says.