Continuity mistake: In the scene at the party, Scott is in a large group of mixed people doing party games. He's waiting for his turn to come and he's got wet hair. Yet when he and Boof are going into the closet, his hair is dry.
Continuity mistake: At the very end, Pamela tells her boyfriend to drop dead and walks away, off to her right. But in the last shot where Scott is hugging his girlfriend and his dad, if you look just to the lower left of them, not only is Pamela still just standing there, but she's to the left of where she was standing before.
Visible crew/equipment: In the first liquor store scene, Stiles is wearing mirrored shades and is talking to the clerk. He slips the clerk a bribe during a close up shot and the camera can be seen in Stiles' shades.
Continuity mistake: In the final basketball game #23's hair is wet from sweat and gets knocked to the ground by Mick. It cuts to the coach. #23 is standing next to him with dry hair, immediately followed by a shot of him being helped up by his teammates and carried over to the bench.
Continuity mistake: When Scott enters the dance as the Wolf, and he's walking through the crowd, you can see Chubs is right behind Mick and Pamela, and Stiles is next to Chubs. When the shot changes, Stiles is now behind Mick and Chubs isn't seen. Scott walks past Mick and Stiles and in the next shot, he hasn't passed them yet and Chubs is back behind Mick.
Revealing mistake: After the first game in the locker room, Scott notices a 6 inch long hair on his chest, the hair is visibly taped to his chest with scotch tape.
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.