text: Other inconsistencies and anachronisms Numerous other inconsistencies and anachronisms are present in the film, and it appears that "little to no effort was used to try and hide or disguise modern warships to match the early 1940s setting."
  Some other historical inaccuracies found in the film include the early childhood scenes depicting a Stearman biplane crop duster in 1923; the aircraft was not accurate for the period, as the first commercial crop-dusting company did not begin operation until 1924, and the U.S. Department of Agriculture did not purchase its first cotton-dusting aircraft until April 16, 1926. The crop duster in the first scene set in 1923 was not commercially available until the late 1930s.
  The later series cannon armed Spitfires used in the film were inaccurate, as the RAF had chiefly machine gun-armed Spitfire Mk I/IIs during the Battle of Britain. Limited number of early cannon-armed Spitfires Mk.IB served for brief time with No. 19 Squadron RAF, but these proved to be too unreliable and were soon withdrawn from active service. They also differed slightly from later cannon-armed Spitfire versions, which possessed both autocannons and machine guns, as their armament consisted of single 20 mm British Hispano cannon in each wing only. Ben Affleck's Spitfire is painted with the insignia "RF" – this is an insignia of No. 303 Polish Fighter Squadron.