Deliberate mistake: Smith and the team come down the mountain and into the village at dusk, yet it is light out during the entire movie.
Where Eagles Dare (1968)
1 deliberate mistake - chronological order
Directed by: Brian G. Hutton
Starring: Clint Eastwood, Richard Burton, Patrick Wymark, Mary Ure
Factual error: The Germans in the castle are using Bell 47 helicopters which a) were American, not German, and b) weren't even in operation until 1946.
Mary Ellison: I nearly froze to death in that damn plane. Why couldn't you have supplied some hot water bottles or an electrically heated suit? I thought you loved me.
Major John Smith: Can't help what you think.
Trivia: The idea of helicopters was not necessarily new in WW2, but effective designs were not made until after the war; there is evidence from some literary sources (one of them being a book named "German Secret Weapons of WW2" or something like that) that the Germans did indeed conduct experiments and designs on this vehicle type.
Question: When Richard Burton is holding his gun on all the people in the meeting and asks if one of the guards could come in and watch them, why doesn't the guard just shoot him?
Answer: When the guard comes in, Burton explains what's going on. Also he is dressed as a German officer so his explanation and actions are plausible.