Continuity mistake: When Miss Gruwell and the students are discussing junior year for the first time, she has her back turned and she is writing on the board. When she writes, "First Person Na", she turns around before finishing the last word, but in the next shot, "First Person Narrative" is written on the board.
Continuity mistake: When Mrs. G. is writing her name on the board on the first day of school, she erases with her hand and wipes it on her butt in a long swipe. When the boy says, "Can I get some fries with that shake?" the long swipe pattern of chalk has changed to a thick circle pattern.