Continuity mistake: During the beginning of Wayne's "fight" with Cassandra's father, a white Stratocaster guitar can be seen in the background, but the guitar disappears after the two switch positions.
Continuity mistake: When Wayne brings Del Preston to Stan Makita's, Del tells his M&M's story, and a waitress walks behind Del with tea, serves it, and walks away. The camera switches to Wayne and then back Del. The waitress is now behind Del even though she left before. (00:23:15)
Continuity mistake: At the start,Wayne re-introduces us to Cassandra in a dream sequence. She is shown playing bass left handed. In the first movie,she plays right handed.