Factual error: When Max and Vincent are at the second contract killing destination, Dispatch calls and Vincent is holding the receiver. In one particular shot he does not release the button on the side of it and we hear Lenny speaking. This would not be possible: he would have to release the button first to hear what Lenny is saying. (00:29:55)
Factual error: Toward the end, when Vincent et al board the train, they're on the southbound Metro blue line out of 7th Street station. The next stop should be the Pico station, next to Staples Center. But we see them get off an eastbound train along the green line, half an hour's ride and a transfer away.
Factual error: The Blue Line train actually makes many stops with stops occurring approximately every 2 min. (with or without passengers) The scene at the end in the film lasts many minutes without a single stop.
Factual error: When the undercover detective enters the apartment of Vincent's first victim, he calls LAPD dispatch with his cell phone and requests for two "black and whites" and a "night" detective to respond to the scene. All LAPD detectives work on a 9am-5pm schedule except for homicide detectives who are on call 24/7. Requesting a homicide detective would have been the correct choice. It may have seemed fitting to ask for a "night detective" because it's dark.
Factual error: When Vincent and Max enter the Fever nightclub, we hear loud dance music. However, Vincent calmly tells Max to stay near him and not wander off or he'll shoot bystanders first. Anyone whose ever been in a crowded, noisy dance club knows it's almost impossible to have a normal conversation without shouting to be heard above the music.
Factual error: The 2nd location Vincent heads to is on Fountain Avenue in West Hollywood. Upon his arrival, the victim is shown from the inside his apartment and out the window, lots of highrises are shown all over. No such real skyline of highrises like this exist in West Hollywood (especially on Fountain Avenue).