This film was banned in Texas during its theatrical release.

The film takes place in 1865.

Michael Reeves was originally chosen to direct this movie, but was replaced by Gordon Hessler during pre-production. Shooting began November 18, and was completed in December, two months before Reeves died in February 1969.

The moments of extreme violence in this film had to be toned down in order to avoid an R rating.

The first draft of the script was called "Man in the Crimson Hood."