Factual error: The USS Sawfish is supposedly a nuclear powered submarine, but the shots of her entering Williamstown show diesel exhaust coming from her. (Apparently they had to substitute an Australian diesel-electric submarine).
Other mistake: According to the plot, no life is possible in the Northern Hemisphere by the time the film is set. Yet, when the sailor who has been sent ashore to look around the San Diego refinery enters the premises (more precisely, when we see the smoking-prohibited sign on our right and his left) a bird can be seen flying in the upper left-hand corner of the screen.
Adm. Bridie: Would you have a glass of sherry - with an old man?
Lt. Hosgood (Bridie's secretary): No, sir. But, I would very much like to have one with you, sir.
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