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.
One of Our Dinosaurs Is Missing (1975)
Directed by: Robert Stevenson
Starring: Bernard Bresslaw, Helen Hayes, Derek Nimmo, Hugh Burden
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.
Factual error: When the nannies hide in the blue whale's mouth they peer out between its teeth. A real blue whale has no teeth - it is a baleen whale and has plates of horn-like "whalebone" (baleen) instead.
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