Revealing mistake: In the scene where the children are stopping the train with the red petticoats, just before the train has completely halted, you can see the reverse effect used in the film. The train is actually reversing away from them for safety, and when reversed, the red petticoats are swaying with unnatural movements as they're being waved by the children.
Continuity mistake: About 3/4 through the film, which is supposedly set in the 1900s, there's an exterior shot of Jenny Agutter (as Roberta) talking to William Mervyn (as "the old gentleman"). Over Mervyn's shoulder can be seen a white delivery van driving rather fast along a road on the other side of the valley from where the filming took place (this is very obvious in the wide-screen version but less noticeable in the pan-and-scan TV version).
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