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On the door above the airfield office there is an elevation of 2750 ft. The only airport in California at that exact elevation was the Quartz Hill Airport in the region of Palmdale, California. Anthony Cardoza has confirmed that Skydivers was indeed filmed at this location. This airfield fell into disuse in the 1980s and as of 2005, it and its environs are now almost completely covered by tract homes.
According to 'The Mystery Science Theater 3000 Amazing Colossal Episode Guide,' staff writer Paul Chaplin claims that "when we first saw 'The Skydivers,' we believed it to be one of the worst movies we'd ever done. As it turns out, it's the best of the Coleman Francis trio of films."
The lake upon which Suzy and Harry and later Suzy and Frankie are seen boating (where a large dam is seen in the background) is Castaic Lake, California, approximately 1 hours drive south of Quartz Hill Airfield.
According to Anthony Cardoza, the sky-diving sequences were filmed over Lake Elsinore, CA and Hemet, CA. Lake Elsinore can be seen in the distance of some of the skydiving footage.
Coleman Francis: [coffee as calming influence] The characters repeatedly offer each other coffee as a welcoming gesture. Later, they relax while drinking coffee.