Super Bike / A Mile in My Shoes - S2-E6
Other mistake: When Jorgen does wand-ups to Cosmo and Wanda, he counts 1,2,1,2,etc, yet when he does them to Timmy, he counts 1,2,3,etc.
The Boss of Me/He Poofs, He Scores! - S7-E14
Other mistake: In "The Boss Of Me", when the indestructible pencil appears, as it slowly rotates, the name "everleady" is already written in red on the side. Then Timmy's dad says "I'll call it the Everleady" as if he's created the name.
Fairy Friends and Neighbors/Just the Two of Us - S4-E11
Continuity mistake: When we first see Trixie and Timmy inside Timmy's large sand castle (or whatever it was), they were sitting at the ends of a long table. But when Francis destroys the castle, Trixie and Timmy are way closer together.
Denzel Crocker: Hey, Turner exploded! That's one less mouth to teach.
The Big Problem! / Power Mad! - S1-E1
Trivia: In the episode "Power Mad", when Timmy, Chester, and AJ enter the video game, their outfits are almost identical to the virtual outfits in the movie "Tron".
Question: Why does Timmy wish for Christmas Every Day so he can get more toys? Couldn't he just ask Cosmo and Wanda for all the toys he wants?
Answer: He didn't wish for it just to get more toys. He did it because he enjoys all of the Christmas experience, including his Mom and Dad being able to stay home, and not having to be babysat by Vicki.