Revealing mistake: The British intelligence officer Wells, who is being trained to infiltrate the Gestapo headquarters at Lyon, would never pass as a German because of his slight but still quite noticable accent. (00:47:45)
Revealing mistake: On their escape in the jeep from the Gestapo headquarters the two protagonists are shot at directly from the front. One bullet makes a hole in the windshield right in front of Sellinger's chest and should have hit him. (01:27:15)
When Halloran sets the barn on fire to distract the Germans he lights up some straw with a match. All of a sudden you see flames flickering up at various places which could not be caused by the fire he made.