Where's Wanda? / Imaginary Gary - S3-E12
Continuity mistake: When Wanda is in Level 14 Probation, Mama Cosma writes "Level 14 Probation" (in capitals and lowercase letters) on the board, but when Wanda yells "NO..", the board reads "LEVEL 14 PROBATION" in capitals.
Where's Wanda? / Imaginary Gary - S3-E12
Continuity mistake: Gary does a sliding trick with the apple, eats it, and throws it as if Timmy were beside him, yet at the next shot, only Mom and Dad are there, not Timmy. Also, Timmy is farther away from Gary.
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.