Continuity mistake: After the scene featuring pictures of Martin Lawrence with a big afro, Julia asks him how Marcus's wife is. She adds in a close-up that she must be pretty amazing. Look at her hand, palm against her cheek. That's not the pose she has in the next, wider shot. That's the pose she will get to a few seconds later when she says, "Watching him tonight," etc. (01:18:25)
Continuity mistake: Inside the suite, Julie takes a sip from Max's glass. Behind her, Eddie Dominguez giggles, "Watch your step." He rubs his already powdered nose, then touches the glass. Cuts to a wider angle, and Eddie is repeating the exact same movements - but Julie isn't. (00:25:00)
Continuity mistake: The Bad Boys enter the precinct, made into a crime scene, through an overhead shot. To their left as they come in, a cop in a suit with fair, curly hair makes a turn around a desk corner. It cuts to Will Smith saying, "Hey bay-beh!" tapping Francine's desk. A different cop is behind them, then it cuts to a wider shot with Martin Lawrence in a more subdued greeting, and the same cop from the first shot does the same turn as before. (00:12:10)

Continuity mistake: When the two female characters enter the fancy hotel room, they make a point to say they will only be there for a couple of minutes. It is daylight when they go in. The visit is cut short (the one that's supposed to be a few minutes long) because of a gun battle in which one of the women dies and the other escapes. The escaped one gets out through the roof into an evening's sky. There's still light visible, but for a visit that lasts all of 4 minutes, it's far too quick a change. (00:23:00)
Plot hole: Why was $100,000,000 worth of heroin sitting in the police vault all this time before the bad guys stole it? Wouldn't the DEA have taken possession of the drugs long before that?
Continuity mistake: When Marcus meets Julie Mott she attacks him with a bat. He takes the bat off her and moves to leave. The next shot of Julie Mott sitting on the floor shows the bat in the foreground. Cut back to Marcus still holding the bat and he asks her, "Look lady, you ain't got no more bats, do you?" (00:35:00)

Continuity mistake: Just as Mike saves Marcus from being hit by the taxi, there is a blue bumper attached / missing / attached / missing from the taxi. (01:37:05)

Continuity mistake: Before Eddie Dominguez is shot sitting in the chair, the bad guy in the green suit is on the left of the large guy, but when the big guy pulls the trigger the man in green is on his right side. (00:27:45)

Continuity mistake: When Marcus and his wife walk up the stairs in the house, they are having a heated discussion and his wife (off camera) shouts down "and you don't even have your wedding ring on." At this point his wedding ring IS on his finger, then in the next shot the ring is NOT on his finger and Marcus attempts to put it back on. (00:44:10)

Continuity mistake: When Marcus is talking to his wife in bed about having some early morning sex, she gets up and he is leaning on his side. She tells him the kids will be coming any minute and when they do come bursting through the door, Marcus is now under the covers on his back. Given that we heard them approaching, there's no time for him to move. (00:10:25)

Continuity mistake: When Will and Martin are in Martin's car, just after they find the dead guy, watch the microphone hanging from the rear view mirror. Depending on the camera shot, it changes position. (00:20:00)

Visible crew/equipment: At the end of the car chase scene between the Porsche and the AC Cobra on the runway, a shadow of the camera as well as the boom can be seen just as the Porsche drives between the concrete blocks. This can be seen at normal speed but is best viewed in slow motion. (01:50:25)

Other mistake: When the bad guys are stealing the drugs and they use the spray to break the lock, they drag the chain off the bars, and if you look closely you can see part of the bar chip off and it's made of wood. (00:08:10)

Continuity mistake: In the scene at the beginning of the film, when the villain of the piece shoots Julie's friend, he proceeds to turn the gun on Eddie and shoot him in the leg. After Eddie reels back in pain and falls into the chair, a conversation begins. Throughout the course of this conversation, the drool that flew from Eddie's mouth and landed on his right lapel, disappears and then reappears. (00:27:30)
Continuity mistake: In the final car chase - in the close-ups - we see Marcus turning the steering wheel quite far from side to side. With the speed they are going that would make the car slalom severely - and probably go out of control. At that speed only very small movements of the steering wheel are necessary (and safe). (01:50:00)

Continuity mistake: In the party scene, when Fouche shoots Eddie Dominguez, his collar goes from being buttoned all the way to the neck and then being opened as the scene goes back and forth between shots. (00:27:25)
Continuity mistake: When Marcus Burnett drops Julie Mott off at Mike Lowery's apartment it's dark outside. When he leaves shortly after, there is daylight outside.

Other mistake: At the very end of the movie Mike has the bad guy down on the ground and he's got his gun in the guys face, we see a shot looking straight up the gun barrel with Smith's eyes over the top of it. If you look at the barrel of the weapon there is a little point of light at the back of the barrel. This is caused by sunlight shining through the firing pin hole in the back of the chamber showing that the gun has no round in the chamber. (01:51:20)

Continuity mistake: When Marcus wakes up towards the beginning of the film, he knocks a Florida snowglobe and some other stuff off the top of his alarm clock. In the next shot, the snowglobe is back on top of the clock. (00:09:30)
Continuity mistake: The kegs of ether in the truck have hazardous material labels applied to them. These are diamond shaped labels that indicate the class of material in the container. Throughout the chase scene they alternate between Flammable Liquid labels (solid red) and Flammable Solid labels (half red, half white). (01:10:45)