Visible crew/equipment: After the math class scene, we see Marcus from behind as he walks toward the bulletin board to sign up for the talent show. In the upper right corner of the frame, there are someone's feet/black shoes and edge of a garment dangling from above. If they don't belong to a crew member, perhaps they belong to Ellie, her part in the scene having been cut out.
Continuity mistake: When Will walks into the auditorium at the Kids Rock Show, you see a student break dancing. He speaks to Rachel about why she is there and she says "That's Ali up there." When she says that, the camera pans to the stage and you see Ali, not the boy from before as they are wearing different clothing. The camera pans back to Will and Rachel and he says "He's uh... Talented." Back to the stage, and we have a different dancer, obviously not Ali. (01:00:00 - 01:26:45)