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 Bishop and "Q" are on the ground of the roof in the final fight scene, you can briefly see a foot of somebody else in the corner of the screen even though they are supposed to be alone on the rooftop.