Factual error: The real RAF chief meteorologist was Group Captain Stagg. For some reason, he is the only character in the series who has been fictionalised, as Captain Burns. However Captain is not an RAF rank. Unlike the fictional Burns, Stagg was not a pilot and had no medal ribbons (he had no previous military service before receiving a war commission for his meteorological skills).
Continuity mistake: At the Chequers meeting in early 1944, Sir Bernard Montgomery is wearing the rank insignia of a field marshal. In the later meeting with the King in which the D-Day plans are announced, he is correctly wearing that of the lower rank of general. In fact, Montgomery was promoted from general to field marshal on 1 September 1944, nearly three months after D-Day.
