El dentista

The real-life serial killer dentist, Glennon Engleman (1928-1999), was not the inspiration for the story of the film. The idea for the movie came from Mark Amin, and was written by Charles Finch, Stuart Gordon and Dennis Paoli. However, Corbin Bernsen had played a character inspired by Engleman in Beyond Suspicion (1993), which has nothing to do with this movie.

The light equipment can clearly be seen in Dr. Gibbs glasses a few times.

Lead Assistant ... Shea "Blood Guy" Clayton.

In order to get a "Not under 18" rating in Germany, the German version was cut by nearly two minutes to tone down the violence in most of the death scenes. The uncut version was later released on DVD unchecked by Laser Paradise; however, due to the "glorification of violence," the movie later got confiscated and outright banned entirely across Germany in 2010. Only in October of 2024 was the banishment lifted. Days after the banishment was lifted, the FSK granted the uncut version of the movie a "Not under 16" rating through re-examination.

Featured in Boogeymen: The Killer Compilation (2001)