Continuity mistake: James Garner figures out he's being duped, and tells Eva Marie Saint to run out of the room screaming to draw attention to herself. She does and there's a shot of her on the hospital lawn with staff all around her. The next shot is James Garner looking out the window to see what their reaction is, and Eva Marie Saint can be seen behind him in the room.
Factual error: When an older lady working for the German cause is collecting items from the US Soldier's room (Garner), she picks out a letter with stamps on it that were not issued until 1954 and 1961...even though the year of the movie and scene is only 1944.
