The new DOOM game is surprisingly awesome, and like Wolfenstein and Fallout, it's full of humorous Easter eggs and subtle nods to other games. Warning: Some of these might be considered spoilers!
Skyrim's Arrow to the Knee Meme
Image Credit: Dynasty
The Thumbs Up Death From Terminator 2
Video Credit: Grizwords
Vault-Tech From Fallout
Image Credit: Shinto29
Commander Keen's Head...On A Stick
Video Credit: GameRevolution GR
DOOM 3's Soul Cube Weapon
Video Credit: Gamer5098
A Bejeweled-Style Mini-Game Because Of Course
Video Credit: EizenLIVE - youtube & streaming
A Mini-Game Where You...Punch Turkeys?
Video Credit: PS4Trophies
Old School Levels From The Original Games
Image Credit: IGN
The Infamous Icon of Sin From DOOM 2
Video Credit: Conargle
Did I miss any? Let me know in the comments.