Dave, as much as there are probably several inaccuracies in this film, I think we have to take into consideration that it was made during the Second World War (over sixty years ago) and things that nowadays are common knowledge would have been sensitive back then. That aside it would be an ideal film to remake using cgi and real aircraft, of course the real problem would be trying to make a truthful film and keep the average (non enthusiast) punter interested.