Corrected entry: During the dog fight when the German gunner gets shot in the face, if you slow the scene down you can see the false blood being squirted into his face from the left of the screen.
Corrected entry: The film takes place in 1940. In at least two scenes on an airfield, a Land Rover (possibly a made-for-defence purposes Defender model) can clearly be seen. The Land Rover was not developed until after WW2 & not actually put into production until 1947, as the British "answer" to the US Jeep.
Corrected entry: The Polish pilots have a translator when being told about what they did wrong, When the RAF chap congratulates them they know what he is saying.
Corrected entry: When the Polish pilots are on a training mission before they were made operational they are shown in loose flying formation. Hurricanes are in the forefront but in the background you can clearly see that the rest of the squadron are flying Me-109s, which were German aircraft.
Corrected entry: On the attack on the airfield by He111s, a burning Spitfire is out of control and heads towards a fuel truck. Unfortunately the truck blows up before the Spit' hits it.
Corrected entry: In many scenes you will see Spitfires diving to avoid the German Messerschmitts. Now the film shows the beginning of the Battle of Britain to the end, well there is one problem with the Spitfires diving, it wouldn't happen. The type of Spitfire in service during the Battle of Britain was the Spitfire Mark 1, which had a carburetor. If the plane dives the engine will stall. Spitfire pilots would never intentionally dive, but Messerschmitt 109 pilots, when being tailed by a Spitfire, would engage in a sharp dive to save their butts as they knew the Spitfire couldn't follow them.
Corrected entry: During the film, a German bomber crew, lost in the dark, accidentally jettison their bombs over London, thus starting the Blitz. In reality, the very first German air-raid on London in late August 1940 was planned and intentional, borne out by the fact that a number of aircraft bombed the city at different times during the night.