Rage Easter Egg - Vault Boy

At around the point that you're sent to visit Kvasir's Lab (and perhaps even before), check the corner of Mayor Clayton's office desk.

Sitting on the upper left-hand corner from the mayor's point of view is a Vault Boy Bobblehead. This is a direct reference to Bethesda's Fallout RPG series. Bethesda Softworks also published Id's Rage so it'd seem Id is thanking those who have foot the bill!