Factual error: About 3/4 into the movie, in the scene where Woody is looking for a place to sleep, he comes upon this other man in a bunk. The guy in the bunk asks Woody if he wants to share his blanket with him because it is cold. Arlo does. In the next scene, outside, it shows the steam locomotive, and to the left of the steamer is a diesel locomotive. It is a Western Pacific GE logo. The movie is 1936 and WP diesels didn't show up till 1953. I was there.
Continuity mistake: Right after the last song John Paul Jones is seen taking his guitar off and resting it on an amp.The scene switches to Robert and when he points to his right JPJ is repeating the action.
Other mistake: On the assault course Hero and Rockbottom are wondering how they are going to get to the concert now that they have lost their van, Rockbottom says that they are well out of the London transport system but when they are on the zip wire you can see two red London transport buses on the road outside.