Stuntman Jack Tyree was killed when he jumped off a cliff and missed his airbags.
Two versions were shot of Lee Horsley's crucifixion in the final reel. In the theatrical version, a spike was shown through the palm of each hand. In the version for TV, Horsley's hands were bound to the wood by means of metallic bands.
The producers wanted Oliver Reed to narrate the movie, but were dissatisfied with his performance and replaced him with Simon MacCorkindale.
Richard Moll only played the sorcerer in the opening scene, because he had a bad reaction to the contact lenses and was sent to the hospital. Xusia's other scenes at the end of the movie were done by a stand-in and later dubbed by Moll.