- Three of the De Havilland Mosquitos seen in this film were airworthy and two could taxi on the ground. The latter two were deliberately destroyed in crash scenes. One of the crashes was filmed from two angles and used for separate scenes.
- The German "fighters" were actually 4-seat Messerschmitt 108 "Taifuns," painted to look like Me-109 fighters.
- Cliff Robertson, an accomplished pilot, bought a Mosquito after filming had finished, as he was so impressed with it. He also owned a Spitfire at one point.
- Most of the attack on the Fjord at the end of the film was done with 1/48th scale Mosquito models.
- The three airworthy Mosquitos used in the film were actually photo-recon versions that had to be adapted into fighter-bomber versions for filming. You can tell as the fighter-bomber had a flat windscreen and the photo-recon had a separated windscreen, as seen in the film.
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