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Factual error: The insignia worn by the submarine crew is inaccurate, including the lack of a white patch behind the trade badges and a strange made-up version of the White Ensign. Also the Submarine service emblem of two heraldic dolphins has them facing the other way.
Trivia: Instead of the Royal Air Force, the series has a fictitious British Air Force with largely invented insignia. Ranks are taken from the RAF, but sometimes different rank insignia is worn (e.g. an air vice-marshal wearing air marshal's insignia and a flight lieutenant wearing flying officer's insignia, although another flight lieutenant wears correct insignia).