Factual error: Group Captain Massey is referred to several times, even by British officers, as "Captain" Massey. Group captains are always called group captains.
Factual error: Johnnie Dodge wears no medal ribbons. Even if the real Dodge had not had the DSO, DSC and MC, it would be inconceivable that a major who had fought in two world wars would have no campaign ribbons.
Factual error: Colonel von Lindeiner was not executed. He testified to the investigation into the Gestapo murders and died in 1963 at the age of 82.
Factual error: MacKenzie is referred to as "Gunnery Sergeant". This is not a rank used by British and Commonwealth forces. He actually wears the rank insignia of a Flight Sergeant.
Continuity mistake: At the start of the film Christopher Reeve is being chased by a German on a Motorcycle. The Motorcycle used is a Jawa 350 two stroke, but they dubbed a four stroke sound on top. When the chase goes off-road the Motorcycle then transforms into a Motocross Motorcycle. (00:02:00)