- Theatrical version distributed by AIP in the United States featured a "violence warning" gimmick, i.e. a horn sound played before violent sequences. This was not included in the Canadian theatrical version distributed by Cinepix. A bell rang to indicate the end of the violent scenes. This version is offered as a bonus audio track on the current DVD and Blu-Ray releases.
- The United States version also trimmed some of the violence to avoid an X-rating. The Shout Factory DVD and Blu-ray both contain the fully uncut original Canadian version of the film.
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