At the very end of the film, in the overhead shot of Chris Rock driving away through nighttime traffic, he goes through an intersection where a driver (waiting to turn left after Chris passes) flashes his headlights at him, because his headlights are not turned on.
At the beginning of the day that Sontee and Wellington have their first date, her hair is parted on the right. When she is kneeling down after he gets knocked out, her hair is parted on the left. Later that evening, in front of her apartment, her hair is parted on the right again.
When Lance/Wellington gets on stage at his own club, he takes the microphone off its stand and the cord disconnects. When the camera cuts back to him, the mic is plugged back in. His volume remains constant throughout.