Factual error: Approximately three quarters of the way in to the film, there is a close up of a German soldier handing an officer a file of documents. The helmet that the soldier is wearing is a post war 1960s version. This can be determined by the lack of an air vent and rivet on the side of the helmet.
Factual error: Characters in the movie were drinking champagne from tall slender flutes; the style that came into use in the 1970s and are still used today. In the 1940s champagne was drunk from coupes or champagne saucers which are wide and shallow, much like margarita or daiquiri glasses.