Factual error: Towards the middle of the movie when when the British submarine leaves port with the Man Who Never Was onboard, it is flying what appears to be an American flag. The flag is visible for about ten seconds and if you look closely, you can see the field of blue of the stars and stripes in the upper corner.
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Suggested correction: The flag, as can be seen before submarine sails and then from a distance, is obviously the White Ensign.
