Continuity mistake: When Jamie is singing in the school play, her solid close-up and her bleed through close-up do not correspond. The solid image blinks but the bleed through does not and vice versa a few seconds later. Obviously, this was two different takes that were super-imposed together that, unfortunately, did not fully correspond with each other.
Continuity mistake: When Jamie goes to see Landon after she has told him she is sick, he holds her head in his hands and then moves them down to giver her a hug. In the next shot his hands are back up on her head and move down once again.
Continuity mistake: During the play, Mandy begins to sing the song "Only Hope", and sits down at the table beside Shane West. You can clearly see a small layer of her hair hanging in front of her right eye. A moment later, when the camera angle switches from the back of her head, to her face again, the piece of her hair is gone.