Paul Naschy had to play a secondary role as Igor the gravedigger because he was acting in another movie being shot at the exact same time.
In the version which was distributed by "International Artists", director José Luis Merino was credited as "John Davidson" and writer Enrico Colombo was credited as "Jack Daniels".
The film's score is credited to Francesco Di Masi and re-uses several music cues from an earlier score he did for The Murder Clinic (1966).
In the German version, director José Luis Merino was credited as "Leo Klimovsky". At that time in the 70s, there actually was a director in Spain with the name [name=nm0459567], though he had nothing to do with the making of "The Hanging Woman".
The DVD release was on September 29, 2009 in the USA, with audio commentary by director Jose Luis Merino, an interview with actor Paul Naschy, and the seldom seen Sid Pink film "The Sweet Sound of Death" (starring Dyanik Zurakowska) as a bonus.