- The large number of aircraft collected for this production made it the 11th largest air force in the world.
- 27 Spitfires in various degrees of repair were found for the film, but only five Hurricanes, three of which were flyable. The Messerschmitts and Heinkels were on loan from the Spanish Air Force.
- According to the book written about the making of the movie the production crew used more ammunition (blanks of course) to film the movie - due to the fact that directors re-shoot scenes numerous times - than was actually used in the real historical battle.
- Adolf Galland, the Luftwaffe pilot who fought during Battle of Britain, who later became the youngest German general at the age of 29, was hired as a technical advisor.
- American special effects creator 'John Fulton' was going to do the special effects for this film. He died in England before principal photography began.
- There were to have been scenes featuring Lord Beaverbrook. Alec Guinness was hired to play Lord Beaverbrook, but these scenes were cut from the script shortly before filming.
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