Continuity mistake: During the scene where Zac Efron is talking to his girlfriend for the first time in the cafe, the reflection of her in the window does not match what she is doing in the scene. (00:25:30 - 00:25:35)
Continuity mistake: The three friends are talking in the cafe about the Morris Chestnut dude. Throughout the scene, the waitress with the polka dot shirt keeps popping in view; when the two shout "Harold?" all of a sudden Jason has his hands on Mikey's shoulder, and at the end of the shot the waitress just vanishes. (00:04:00)
