One of the members of The Sick F*cks ran into star Jack Palance years later in the streets of New York. He said to Palance that he was one of The Sick F*cks in the film and Palance replied 'we were all sick fucks in that movie.'
This was the first feature film produced by distributor New Line Cinema.
Makeup effects artist Tom Savini was brought in specifically to create the horrific monster apparition that Toni has. Savini achieved the startling effect by covering an actor in a concoction of soap and Rice Krispies cereal.
In the script Jack Palance's character was suppose to kill the driver outside the Haven. However Palance refused to do the scene saying it wasn't necessary for him to be seen killing someone for the audience to know that he was a dangerous character. The scene was never shot.
In the original script the punk band that Toni drags Dan and Nell to see was named Nicky Nothing and the Hives. When The Sick F*cks, an actual punk group, landed the gig as the punk band for the film their real name was liked so much that they kept it for the film.