Factual error: When Lt. Dunbar is being interrogated in the Commandant's office you can see a map on the far wall. It is a map of Germany dictated by the Treaty of Versailles which ended World War I because it shows E. Prussia separated from Germany and does not include the annexation of Austria and Czechoslovakia. These annexations were completed before the start of World War II in '39 and certainly before late '44, early '45 when the film took place. It is highly unlikely any German officer would have this map displayed not only because it's inaccurate but because it displayed the territorial losses brought on by the humiliating defeat of World War I.
Continuity mistake: When the camp is trying to save Dunbar with the smoke screen, the smoke pattern changes between the shots. For example, the wide shot shows the smoke going off perfectly without any wind, but in the next shot when they show a close-up of the commandant going outside to see what's wrong, the smoke is now carried by a lot of wind.
Revealing mistake: When Manfriedi and Johnson are in the tunnel at the beginning, the second one has a lighter going to light the way. Trouble is, there is no way that the little flame could light the area as it did. Also, the lighter couldn't have provided light to cast its own shadow inside an area that perfectly round, thereby revealing that it was lit with a light close to the camera.
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