Audio problem: When the elves are marching around, listen to the footstep sounds and watch their feet. A lot of times the noise and movements don't match. This is especially apparent when the five elves who have been taking wish calls go to the transporter.
The Polar Express (2004)
1 audio problem
Directed by: Robert Zemeckis
Starring: Tom Hanks, Michael Jeter, Chris Coppola, Leslie Zemeckis
Continuity mistake: Throughout the movie, the number of cars the train has changes. The scene where Hero Girl's ticket is surrounded by a pack of wolves shows the train having around 20 cars, but the scene where the train's on the ice shows it having 5.
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Suggested correction: The entire journey is likely just a dream. There are many things in the movie that cannot happen in the "real" world, and the number of cars changing is just another aspect of the dreamlike nature of the trip.
Conductor: One thing about trains - it doesn't matter where they're going. What matters is deciding to get on.
More trivia for The Polar Express
Question: How would the train have been able to go back the same way with the ice on the lake cracking?
Answer: Because it's a magic train.