When Raheem walks over to take the gun from Bishop a gun can be seen in Bishop's left pocket. Bishop then pulls out a second gun from behind him with his right hand.
The character "Q" records a demo of his scratching routine in his bedroom. When he goes to the audition and his tape is played it is different from the version he recorded in his room. It is a bit longer and the scratches are more complex.
After the scene in which Q, Bishop, Steele and Raheem had the altercation with Radames and his crew, they ran around the corner and Bishop lit up a cigarette and the very next shot, he has no cigarette and his hands are in his pockets. Then he takes a drag off Raheem's cigarette.
When Q is looking through the New York post newspaper he is reading about Raheem's murder and you can see the date of paper which was Tuesday is April 16th 1991. Then you can see some of the article about the murder and in the paper it says it happen on April 8th which would have been a Monday however Q and his crew robbed the store on a Saturday so the date should of been April 6th.
When Steel, Q, and Bishop are taken in for questioning from the club, the detectives and police shouldn't have entered the crowd because someone within the crowd could easily grab their firearms. The police and detectives should have asked club security or management to escort them to the side or even outside the club.
There should have been a lawyer present when Steel, Q, and Bishop while they were being interrogated by the detectives.
When Q fights Bishop at the end, it's obvious he's wearing knee pads. Both when he emerges from the ladder and during the fight.
There's an obvious stunt double (who's presumably white) and Bishop is black when Bishop and Q were fighting on the roof and Q holds Bishop's hand to try to save him from falling.
When Q tries to save Bishop from falling on the roof. Q says "I can't hold on man." His mouth doesn't move.
When Bishop and "Q" are on the ground of the roof in the final fight scene, you can briefly see a shadow of someone else in the corner of the screen even though they are supposed to be alone on the rooftop.
When Q is reading the New York Times and see Raheem's murder, the article states that "Police received an anonymous 911 call summoning then to an alleyway between 126th Street and Convent Avenue." However, the 2 streets are no where near each other, given Convent Avenue is in Harlem where the murder took place and 126th Street being in Queens.