Internal casino shots were filmed at the Greektown Casino in Detroit, Michigan (as evident by the Greektown logo shown on the TV monitors during the casino sequences). The Detroit Greektown Casino is the only Native American owned and operated casino located in the heart of a large populated metropolis in North America.
There were meant to be many viral marketing tools attached to the film including a collection of QR codes that would, if scanned, give exclusive content. You can see one at 1:9:26. Because of the film's reception from test audiences, the marketing campaign was dropped, and if you scan the code now the result would just show up as "top left 8."
Alicia Vela-Bailey, who played the Japanese Cyberpunk Woman, wears a latex catsuit which looks similar to the latex catsuit that Selene from the Underworld movies wears. She would later stunt double Kate Beckinsale in Underworld: Awakening.