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.
Many of the "stunt men" were just well-built locals, resulting in actors, including Reb Brown, to be hit with the rubber clubs and hatchets being used. One incident, about 18 minutes into the film, Brown got hit in the face with a rubber hatchet, which caused his face to swell for the rest of the day.
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.