Factual error: I have read previous remarks on the site referring to the presence of 'tram lines' in the crops in the shots of the crippled bomber struggling to come in to land at the airbase, indicating that this is an anachronism. If you refer to the opening sequence of the film there is a caption referring to the date May 16th. 1943. At that time of year there would have been no golden, ripened wheat/barley in any case. It would still have been green - certainly in those days, when crops would have ripened later, if anything. In most outdoor, daylight shots of the airbase these same ripened crops can be seen in the background, so at least the filmmaker gets this consistently wrong.