Continuity mistake: Glen Holland owns a Chevy Corvair throughout the film. The car at the beginning of the film is a 1961 model 500 (the base model with bench seats), but at the end of the film it is a 1964 Monza (the top of the line model, with bucket seats).
Continuity mistake: Nutcracker and Marie dock their boat and get out and the Nutcracker’s sisters run out crying. There are some large candy canes on each side of the dock, 4 on the right side and 5 on the left. The camera cuts to a side view as his sisters begin hugging him, the candy canes are suddenly in different angles and heights. Also there are more. 7 on the right side, and 6 or 7 on the left.