Several of the flash/spray/knife dealers are dressed like some of the gang members seen at the big meet. Ex: the British flag shirts and shirts with the handprint.
The game/movie are supposedly, according to the movie, supposed to take place sometime in the not-so-distant future. However, in the game, the year is given as 1979, which is the year the movie was released.
Swan: [from "Quick Rumble"]
Come on, chump! Let's see your moves...! You're in for it now, you p***k...! Make your move...! I'm gonna drive you into the dirt...! Why don't you run while I'm giving you the chance...? Look around! You got the balls for this...? I'll march right through you...! Looks like you found some trouble!