Revealing mistake: In the scene where Calvin is driving with Ricky after bailing him out of jail and Ricky tells Calvin to pull over so he can toss the gun, you can clearly see that Calvin isn't actually turning the steering wheel. You can notice this more after Ricky gets back in the car and Calvin drives away and does a hand-over-hand turn.
Continuity mistake: Near the end of the movie, Calvin is sitting on a couch and his pregnant wife comes in with a mug of something and sits next to Calvin. They start to talk and she takes her left hand off of the mug and lays it on the side of her stomach. The camera angle cuts to the back of the couch and both of her hands are on the mug. The camera angle cuts back to the front and her had is on her belly again.
Revealing mistake: In the scene where everyone is dancing, there is a shot that shows the window. Right before Calvin walks in front of it, a small shadow crosses it. Since the lights in the barbershop weren't previously casting shadows, this suggests a bright light off camera.
Continuity mistake: In the scene where Calvin and Janelle are opening their shops and having a quick conversation, it shows Calvin in one shot taking off his padlock, then in another it shows him shaking the lock off of his key and letting it fall, then another shot, you can see him taking the lock off with his hand.
Revealing mistake: Several times, Cedric-the-Entertainer's scalp moves freely underneath his wig, making it painfully obvious. This is best seen when he lectures Calvin about selling out.
Continuity mistake: After Calvin tells the barbers not to buy any more things from the guy who always comes into the shop to solicit, we see Ricky trying to drop/hide a phone which he has apparently just purchased. Problem is he had given the phone back to the sales guy earlier.
Continuity mistake: When Calvin's wife comes in to ask him about why the guy that he is selling the shop to was there, before she leaves her jacket is sitting her chair as she gets up and when she walks out the door, it suddenly appears on her.
Plot hole: When Eve is in the back room at the barber shop and she is talking to the big guy she has a picture of her boyfriend in her hand. As she leaves the room the picture does not go out with her and we never saw her throw it away. So where did it go?
Continuity mistake: In the scene where a guy is getting shaved by Ricky, Cedric the entertainer comes over to show them how things should be done and gives them a little speech. When Cedric tells the white guy to get him a hot towel, Cedric puts it over the face of the guy who's getting shaved, you see the towel around his face and then the next shot it disappears.