The costumes worn by Overlord and his guards were left over from The Humanoid (1979), which director Antonio Margheriti did the special effects for.
Yor was aired as a miniseries in Italy, using a lot of footage that never made the theatrical release
Reb Brown lost 30 pounds due to the strenuous and lengthy shooting.
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, 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.
Even though he was speaking English when filmed, Reb Brown's voice is dubbed over in the English language version by Gregory Snegoff. For the close-up where Yor yells "Good!" after Kalaa dances for him, Brown was simply belching for each take. However, not all of Yor's lines were dubbed. When Yor shouts, "Damn talking box!" that is clearly Brown.
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.
This film is listed among the 100 Most Enjoyably Bad Movies Ever Made in John Wilson's book The Official Razzie® Movie Guide.
The soundtrack to Yor, the Hunter from the Future (1983), contains music by brothers Guido De Angelis, Maurizio De Angelis and, separately, John Scott. Although John Scott was hired to compose music for the US version, most of his music was replaced by additional music composed by Guido and Maurizio de Angelis. Accordingly, the score was nominated for a Razzie Award, "Worst Musical Score." Regrettably, John's name remained as composer of the film. An Australian CD release features only John Scott's work.