The film uses the rotoscoping technique of animation in several shots. This process consists of shooting models and actors, then tracing the shot onto film for animation purposes. The B-17 bomber was shot using a 10-foot (3 m) replica, which was then animated. Additionally, Taarna the Taarakian was rotoscoped, using Toronto model Carole Desbiens as a model for the animated character. The shot of the exploding house near the end of the movie was originally to be rotoscoped, but as the film's release date had been moved up from October/November to August 7, 1981, a lack of time prevented this. This remains as the only non-animated sequence in the film. During development of this film, the Canadian animation studio, Nelvana Limited, was offered the chance to work on "Heavy Metal", but they declined their offer, instead working of their first theatrical film, "Rock & Rule".