Other mistake: When Scott is delivering the hardware store supplies for the play, the cans of paint he is carrying awkwardly flip about like empty ones, and when he drops it makes a hollow sound. I'm sure they are meant to be full.
Other mistake: When he reveals his teen wolf appearance for the first time in the garage to his friend. His friend has a T-shirt on - when he moves closer the writing appears reversed for that shot.
Suggested correction: I've watched the scene, a few different platforms, and this never happens. Perhaps you saw it on a different version and should submit a screenshot.