While Andy Biersack is a musician in real life (Black Veil Brides), the vocals for songs in the movie were done by Remington Leith, the lead singer of Palaye Royale.
Andy Biersack and Ben Bruce have their own bands. Ben is in a British metalcore band called Asking Alexandria; Andy is in the American rock/metalcore band called Black Veil Brides.
The top of the stairs of the Rainbow Bar and Grill, which are ascended in the film, now display an American Satan movie poster, appropriately enough.
In the scene where Johnny (Andy Biersack) buys a new car, when he gets in and his hand is on the steering wheel, Biersack's real wedding ring is visible.
The album cover seen at Mr. Capricorn's favorite table in the Rainbow Bar and Grill is Rising, by the band Rainbow, released in 1976. The artwork of a fist gripping a rainbow was done by Ken Kelly, best known for designing album covers for the band KISS. It is widely reported that the band got the name Rainbow from the iconic Hollywood landmark featured prominently in this film. As of 2017, the only surviving members of the band that played on this record are guitarist Ritchie Blackmore (formerly of Deep Purple) and keyboardist Tony Carey; the late Ronnie James Dio and Jimmy Bain are actually buried not far away at the Forest Lawn Hollywood Hills cemetery. The other member of the band, Cozy Powell, died in a car crash in 1998.