Character mistake: There's a corporal sitting against a rock wall smoking a cigarette. Two privates both call him sir. Enlisted soldiers are not called sir.
Factual error: During the shooting inside the freight yard, the soldiers ducks behind a pile of concrete sleepers, too modern for the era.
Factual error: There's a scene where a medic is giving CPR. CPR wasn't adopted by the US military until 1957.