The screenplay was adapted by author David Osborn from his own novel of the same name: The movie credits refer to a work called "The All-Americans" but in actuality the book was simply called "Open Season" (Dial Press, New York, 1974). The interior scenes inside of the hunting lodge were all filmed on a soundstage at Pinewood Studios in England on a life-sized set. The opening scenes at Kenny's house and the exterior scenes on the island were all filmed on location in Spain. ...[Read Story ]