Revealing mistake: When Austin enters the bathroom at the casino, keep your eyes on the door during the scene - it opens by itself before closing. (00:31:10)
Visible crew/equipment: The cameraman is visible in the reflection of window while Holden is walking back to his car in the rain.
Continuity mistake: When they are running the obstacle course, the amount of hoops in front of the girls changes from five, to two, to five again.
Audio problem: When Will Smith is looking at the two space ships at the MIB headquarters, if you look in the background Zed and K are there typing on the computer. But if you look closer you can tell that they're not even touching the keyboard and the sounds are just added into the movie. (01:16:00)
Continuity mistake: At the beginning of the movie when Romy reunites with Heather Moony, Heather tells Romy that she invented the cigarette which she is smoking and takes a puff to show how fast it burns down, and the cigarette burns to the butt. But in the next scene her cigarette is still to its half-way point. (00:07:25)
Plot hole: When Andy turns into a werewolf, he kills both Amy and Detective Benbou. Later in the morgue, Amy tells him because of this that she is forced to become his "rotting sidekick." If this is completely true, then Detective Benbou should also be following Andy around but he isn't seen after Andy manages to escape from the morgue.
Continuity mistake: The whole big prison bus escape scene revolves around Chris Tucker being handcuffed to the French guy, but when Frenchy's friend arrives in the bus he stands up and hugs him while the handcuff is shown completely unlocked from Tucker's hand. In the next shot and the entire next scene they are still handcuffed together.
Continuity mistake: When Jules is leaning against Michael's hotel door she is smoking a cigarette. When he opens the door she falls back and ash from the cigarette falls on her hair. Two shots later it is gone and her hair is rearranged while she is still on the floor. Then the ash reappears a few shots later.
Continuity mistake: At the beginning of the movie, when Clark is driving down the street looking at the map, there are 4 kids roller blading in the street. In one shot, one of the kids jumps onto a parkway lawn to avoid being hit by Clark's bad driving. Next shot, when they pan back to the kids, all 4 are still on the street.
Continuity mistake: In the scene where Lyle and Ursula slide through the river then over the falls, when they go over the waterfall they are both dry.
Continuity mistake: In many places in the movie, a cat noise is heard even though the cat's mouth is quite obviously not open or the cat is licking its face.
Continuity mistake: When Pest leaves the bathroom at the beginning of the movie, you can see a towel wrapped around his waist. The shot goes to a full body shot and you see him whip the towel off. The next shot is of his knees down and the towel is back.
Continuity mistake: When Howard supposedly has radio sex with that blonde woman, it flashes to other locations where people are listening, including one with police officers standing by early to middle 1990s Ford Crown Victorias. Howard did the stunt in the mid 1980s.
Visible crew/equipment: When the dad gets in the big accident, as he swerves the truck, you can see a hand reach out and grab him.