On the highway, Christine makes a remark about the possibilty of KISS producing a disco song. The boys laugh it off, but in fact, the year after which the movie takes place (1978) , KISS did indeed come out with a hit disco song - "I Was Made For Lovin' You". Christine's remark is a joke pertaining to the song.
The first protesting mother seen outside the KISS concert (with brown curly hair and glasses) is Pamela Bowen, credited as the MATMOK Lieutenant. Pamela Bowen was the real-life spouse of Paul Stanley, lead singer and guitar player for KISS. They divorced in 2001.
The church that the production crew had chosen, had puled their location permit and wouldn't let them shoot inside the church even though the production crew had the church for weeks on hold because they read the script and didn't like it that Jam and Beth have sex in the confessional booth, so they had to find a different church.
Each of the members of the band Mystery (Hawk, Trip, Jam, and Lex) mirror the members of the band KISS and even get together with girls appropriate to their counterparts: Hawk is like Paul Stanley, and gets the supermodel; Jam is like Peter Criss, and gets Beth (named after his solo song); Trip is like Ace Frehley, and gets the spacey girl; and Lex is like Gene Simmons, and gets Christine (named after one of his trademark songs).
In the original script, there was a scene where Hawk confessed to Amanda that he never knew his mother, because she died while giving birth to him. This could possibly be why he yells at Trip and Lex for making fun of each other's mothers in the beginning of the movie.
On the exterior wall of the women's nightclub "It's Raining Men", above the red entrance awning, there is a larger-than-life picture of a well-built naked man with a glowing, glittering star covering "the goods". The head on this cutout is that of director Adam Rifkin. This is his cameo in the film, as actually acting in front of the camera would have violated the terms of his work visa (the film was shot in Canada).
Edward Furlong is not actually vomiting into the pitcher after the stripping scene. He has a hose that went up his jacket and on the side of his face and someone is off-camera with a spigot turning on and off the vomit, and the interesting thing is, is that they had to keep shooting it over and over and it was making the crowd nauseous.
A large portion of this movie, including scenes at the church and Blump's Burgers, were filmed at King and Church Streets in Toronto, Canada. In fact, the "Blump's Burgers" sign was still there even after the movie was released in theaters.
Adam Rifkin: [Blump's] Rifkin uses products and services using the Blump's name in each film. This first appeared in The Dark Backward so as to not have any current-day products in the film (to impart a sense of timelessness). Numerous items in The Dark Backward were products of "Blump's Industries", which was invented for the film.