Continuity mistake: The layout of Zack's room is different in the beginning of the movie than the TV show. In the TV show, his door is to the left of the window and in the movie, his mom walks in from the right of the window.
Suggested correction: This movie was made two years after the original show ended. In those two years, it is possible that Zack's parents moved to a new home (even if in the same area).