Shiny Teeth / Odd Odd West - S2-E15
Revealing mistake: In 'Odd, Odd West,' Timmy's mouth goes right through his mask.
Shiny Teeth / Odd Odd West - S2-E15
Revealing mistake: In 'Odd, Odd West,' when Timmy's dad is riding the kids like a horse, Chester's bit goes right through his teeth, and when he closes his mouth it goes through his lip.
Most Wanted Wish / This is Your Wish - S3-E4
Revealing mistake: In Most Wanted Wish, pretty much everybody's eyebrows are in their hair.
Remy Rides Again/Hassle in the Castle - S5-E10
Revealing mistake: In the episode Hassle In The Castle, in the hall of Infamy the name plates are either scribbles or they're just blank.
Answer: It's a joke. One cannot list all forms of entertainment. The list would never end. The boys were trying to convey how superior they were to the others, by saying that they were too good for comedy.