At the end of the film, when Jacob/Money receives the letter from his son, it's addressed to 'CA Rehabilitation Center' in Norco, California. Indeed, there is a California Rehabilitation Center in Norco; however, it's mainly a rehabilitation center for non-violent, low-level drug addicts--definitely NOT a facility where a hardened, gang-connected, violent criminal would ever be housed.
Although the story takes place in California, the bus taking prisoners to jail has Florida Department of Corrections logo on its side.
Redwood, a member of the Aryan Brotherhood, has a tattoo of a four leaf clover which he shows when talking to Money and Ripper in the yard. The Aryan Brotherhood symbol is a shamrock not a four leaf clover.