Rock 'n' Roll High School

Other mistake: Before the hall monitor folds the note into a paper airplane, the note has creases as is it was already folded into a paper airplane, and then flattened out for a different take.

Add time

Other mistake: In the scene where The Ramones are playing "Pinhead", they say: "D-U-M-B" as the letters appear in a very big size. But when they say it again, it appears like this: "D-M-U-B."