Reb Brown, a black belt in both Shinto-kahn and American karate, and a purple belt in Gracie Jiu-jitsu, performed all of his stunts on the film.
''Yor'' was broadcast as a mini-series in Italy using a lot of footage that never made it to the theatrical release.
Reb Brown had to maintain his muscular physique during the six months of shooting. Because there was no exercise equipment for him to work with, he ended up doing a minimum of 1,000 push-ups and sit-ups every other day.
The costumes worn by Overlord and his guards were left over from The Humanoid (1979), which director Antonio Margheriti did the special effects for.