The line in which the guitar player says "Enough of that mumbo jumbo bullshit" was a line from the movie "Evil Dead 2" in which one of the characters says the same thing. Evil Dead 2 was a huge influence on the movie.
During the scene with Tom Araya from Slayer, Araya is seen wearing a shirt from the band "Church Ov Melkarth." COVM is the primary band of co-writer, Jvstin Whitney.
The character "Stooge" was a nod to the character of the same name in "Night Of The Demons."
The idea and concept of the movie was fleshed out over 11 years during alcohol-riddled conversations between the two writers.