Other mistake: When both vessels are damaged, the American Commander throws a rope to the U-boat captain; the German loops the rope around a pipe and ties it off on another pipe. He then proceeds to wrap the rope around his friend. The view switches back to the American and then back to the German, who has now managed to tie an elaborate cradle around his friend. There was no way he had enough rope or time to accomplish this. (01:28:01)
Other mistake: Near the beginning of the movie, at the same time the ship makes radar contact, the sub acquires a signal on its oscillator. The sub captain thinks it's a false echo due to the rough seas. He so advises the next man that comes on duty but tells him that if the signal appears to get any closer, "you will awaken me immediately." The captain isn't awakened until the "dive" alarm sounds after the men in the conning tower make visual contact with the ship. Wouldn't the oscillator signal closing in on the sub have warned them long before they made visual contact?
