Rage: Campaign Edition Easter Egg - Eggs of Doom

When you get a rocket launcher, stand in place for about 5 minutes with the launcher equipped. The targeting screen will show a game of Doom being played.

The black mugs are Doom coffee mugs.

Boxes bear the MIXOM label in Wellspring, and a Mixom building is near Dead City. Doom featured the Mixom tool company.

Crazy Joe is wearing a Doom shirt.