Revealing mistake: When Hettie drives her motorbike up to the café for the first time, you can see the horse and cart in the background zoom across the frame - because of the film being sped up at that moment.
One of Our Dinosaurs Is Missing (1975)
1 revealing mistake - chronological order
Directed by: Robert Stevenson
Starring: Bernard Bresslaw, Helen Hayes, Derek Nimmo, Hugh Burden
Factual error: When the Chinese are loading crates onto the truck with St Paul's in the background, two much more modern buildings are visible either side of the cathedral - out of keeping with the 1910s/20s setting.