Continuity mistake: When Gregor and Willie are attacked by the German convoy, they pick up two discarded StG 44s, but in th next scene they are firing AK-47s which had not yet been invented. After the battle, they are again carrying StG 44s.
Continuity mistake: In the scene when Richard Harris and Kirk Douglas parachute back into Norway, there is a white parachute blowing in the wind. Kirk Douglas goes to collect it, but there are footprints already in the snow where they have previously filmed a retake. (00:27:00)
Continuity mistake: At the beginning of the movie (until Wasson's name appears in the credits), James Madison is writing on a paper copying from a large tome. Two people enter the room carrying a trunk. When he stands to go open the trunk and check its contents we can see that the book is gone from the desk. However, we see it again a minute later...when he picks it from those in the trunk and brings it to the desk. The first shot was a repurposed one. (00:00:50)
Continuity mistake: The little Nono is singing the nursery rhyme in front of the cafè. One of the nazis tosses him a coin, while the other puts the cigarette down, but at the cut he's already taking a puff.
Continuity mistake: During several of Eddie's jumps and most notably his final 90m attempt, the advertisement on the underside of Eddie's skis changes during the jump as the camera shot cuts back twice in a slow motion shot. The advertisement changes from "Fischer" to "fleuge.de", both of which are commonly seen on modern day jumping skis, not on skis of the time.