Based on the true story of Azie Faison Jr., Alberto Martinez and Richard Porter. The trio controlled much of the drug trade in New York City in the 1980's.
Six people were actually held prisoner in the scene where Ace and a friend were bundled into the apartment by Calvin's accomplices who demanded the combination. All six were shot in the head when the extortion attempt failed and three died, including Faison's aunt. The real life Calvin, Kevin Clark was not murdered in a revenge killing by Rico, as is depicted in the film. Kevin Clark and his accomplices, Ronald Timmons and Henry Bolden were all arrested soon after the incident and are serving 112 years - to life sentences.
When Mitch and Ace are talking in the red BMW if you look at the background as they are driving by you can see what appears to be a 90s model Ford Explorer and also a second generation Nissan Pathfinder in front of it.