Other mistake: During the play where Sally walks out on Landon's character in the club, you can see Mandy eyeing Shane and smiling under her hood as if they weren't filming anymore. (00:37:10)
Other mistake: When Landon tells Jamie "In your dreams", as he and his friends are walking off, Landon and his ex-girlfriend are walking arm in arm to class. This is after Belinda invites Landon into her house and he tells her that its over. In the commentary with the actors and director, Shane West says that he and Lauren German thought the cameras were off. (00:30:10)
Other mistake: During the scene when Jamie is humiliated in the cafeteria with the flyers, the flyer that Landon holds up has a girl with a bathing suit and Jamie's head. But the flyers on the table show the girl completely naked with Jamie's head on it. On the DVD commentary with Shane West, Mandy Moore, and the director, they say that they had to CG a bikini on the one picture because of the rating of the movie.
Other mistake: On Landon and Jamie's first date, they are dancing. When the camera backs away and is going to go onto the next scene, you can see that Landon and Jamie are standing there, barely moving, and laughing. Mandy Moore confirmed later that they were wondering whether the scene was over or not and wondering whether they could stop dancing.
Other mistake: In the rehearsal scene, you can clearly see as the camera moves back that Jamie is cracking up as Miss Garber is demonstrating how to walk.