Audio problem: When John Wayne has his back turned and tells the newspaper man "print that and he will kill you sure as hell", you can tell by the side of John Wayne's face that he isn't really saying anything.
Audio problem: At the end of the movie when the helicopter is flying into the area where the army team was held, the radio transmissions you hear are not aircraft pilots or controllers. You are listening to railroad dispatchers and trackside detectors.
Audio problem: The voice of the German soldier, who corners the French Resistance woman at the railroad track near Caen, sounds completely different when he attempts to stop the train.