- One of the stunt flyers was Richard D. Bach, the pilot and author of Jonathan Livingston Seagull (1973).
- Reused the vintage airplanes from Blue Max, The (1966).
- Director Roger Corman's soon-to-be wife, Julie Halloran, filled in as a gunner in one of the planes during the raid sequence when the production came up one actor short.
- Production was shut down briefly due to a disaster on another semi-related film in the area. Birch Williams, an American living expat in Ireland, was the owner of the period planes Corman leased for the production. He was so interested in and excited by what Corman was doing that he decided to make a similar film himself, using his own planes. Unfortunately, there was a midair mishap, and Williams and two pilots were killed. In response, the Irish government shut down all film flying, and the insurance company cancelled Corman's policy. It took several days of negotiation to get their status restored, and to resume production.
- While the dogfights were shot in Ireland over a two-week period using actual vintage planes, the crash sequences were filmed at Andrews Air Force base in a single day, using models assembled by a group of teenaged hobbyists Corman happened across while scouting locations.
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