During the Halloween Party level, an NPC will appear that bears a striking resemblance to Billy "Big Bang" Blitz from the game Clash at Demonhead. Tom, a palette-swap of one of the enemies in the game, is based on Tom Guycot, who is also from Clash at Demonhead, and serves as one of the game's villains. Additionally, in the original "Scott Pilgrim vs. the World" graphic novel series, Envy Adam's band "The Clash at Demonhead" is named after the game.