Trivia: References to the game series include: Weapons: the BFG 9000, shotgun and chainsaw Characters: John Carmack (co-creator and former lead programmer of the series), Malcolm Betruger (Doom 3's antagonist) and the ship's AI Daisy (the name of protagonist Doomguy's pet rabbit) Enemies: zombified humans, the fireball hurling creatures (called imps in the game) Quotes: "I'm too young to die", "ultra nightmare" (the easiest and hardest difficulty settings respectively) Additionally, the name William J Blazkowicz is a reference to William Joseph "B. J." Blazkowicz, the protagonist of the Wolfenstein series starting with Wolfenstein 3D, the game that Id Software created prior to releasing the first Doom game.
Trivia: Peyton List voices Poison Ivy. In the TV show "Gotham", List plays Ivy Peppers, who becomes Poison Ivy.