The film was unreleased in the UK until 1967 and then received cuts for an 'A' certificate to edit the witch attack on the ship, Princess Elaine being attacked by the giant, and Jack's fight with the dragon.
When Charles Schneer and Ray Harryhausen were looking for a producer for The Seventh Voyage of Sinbad, one of the hopefuls was Edward Small, who turned them down. When Sinbad proved to be a huge hit, Small was determined to duplicate the former movie with the same director and stars. Although he couldn't get Harryhausen, Jim Danforth came close to duplicating Sinbad's monsters with Cormoran, the flying dragon, and the Imp instead of the Cyclops, Dragon, and Genie.
During the scenes in The Last Man on Earth (1964) where Morgan is attacked by vampires, a score is played which is nearly identical to the music which plays during the Cormoran (giant) attack in 1962's Jack the Giant Killer.