Those Magnificent Men in Their Flying Machines (1965)
2 other mistakes
Directed by: Ken Annakin
Starring: Alberto Sordi, James Fox, Sarah Miles, Stuart Whitman
Other mistake: The Japanese plane and the German plane are actually the same aircraft, a British Design called an "Eardly Billing". The "Japanese" version is re-dressed with canvas partitions between the wings, painted dragons, etc, the "German" has no canvas and German eagles, but they are the same machine.
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Other mistake: As the planes go over Dover you get a very nice view of the modern harbour complete with cross Channel ferries and oil tanker.
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