The pre-credits sequence featuring Arthur Frayn's disembodied head was added by director
John Boorman after the movie was released, as an attempt to explain the plot to audiences that found it hard to understand. Boorman would later declare that the scene didn't work as he wanted it to.
- The Spanish (Spain) released version cut part of the "boner" scene (the breasts-rugging and mud wrestlers on-screen). Later prints and current DVD and video releases are uncut.