Pip-Boy brand energy bars, a health item in the game, are a subtle nod to Interplay's Fallout (1997).
Bawls, a health item in the game, really does exist and is a popular soda among gamers. The two products did cross promotion for each other around the release of the game. Bawls vending machines are featured inside of the game, as well as the soda itself, and for a while Bawls featured artwork from the game on its 12-pack cases. The actual product looks identical to how it is featured in the game inventory.