Prior to filming, Adrien Brody did undercover research as a union member in Los Angeles. He went to conventions and sat in on strike talks. A couple of the members recognized him, but Brody persuaded them not to blow his cover.
Cameo: Robin Tunney as a party guest
Both Adrien Brody & Elpidia Carrillo both appeared in the Predator franchise. Carrillo was in Predator (1987) while Brody worked on Predators (2010).