ok,in the scene where rafe first arrives at the RAF aerodrome you can see several supermarine spitfires in the backround and if you look you can see 5 bladed spitfire the 5 bladed spitfire did not come out until 1943 and in the pearl harbor scene you can see a mix of different P-40's and in 1941 only the B through D versions were used and you can see the P-40e's or m's i cant tell that have a much larger air intake in the forward section and have all the machine guns in the wings the p-40's at pearl harbor had 4 in the wings and 2 in the nose