Continuity mistake: At the briefing before Halloran's second mission there are three bright ceiling lamps switched on in the hall. Immediately after the briefing Col. Bart wants to have a private word with him and the lamps are switched off, without any visible change of lighting.
Continuity mistake: The informant who calls the Germans when Halloran and Sellinger hide in the barn is wearing only a shirt when he is seen behind the curtain. A moment later, when he makes his call, he is wearing a jacket and a hat. Why would he put those on just to make a phonecall?