Continuity: In the scene where Will Smith throws a rock at the escaping Edgar alien, if you watch the rock after it hits the alien, it disappears after hitting the ground.

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.

Continuity: Just before the diner scene, where the two aliens are discussing the galaxy, we see the outside of the Russian restaurant. The neon sign says "haroshaya" meaning "good" all the way across the window, in the next shot inside the restaurant, the "ha", which looks like the English letters "xo", is gone and the sign is centered.

Audio problem: In the beginning of the movie when Will Smith first meets Rip Torn with all the other recruits, after he hands them the tests, look and listen very carefully. When Will pulls the table the noise for the table actually starts before he even pulls the table.

Visible crew/equipment: In the scene when Tommy Lee Jones shakes the dog asking him about the galaxy, right before they exit the car, you can see the camera man in the shiny black door frame.

Continuity: In the scene where the Bug's spaceship floats over Shea Stadium and the NY Mets outfielder sees it and gets conked on the head by the fly ball, he is wearing number 23. In a later scene, when J picks up the tabloid newspapers, the photo of the ballplayer has number 20.

Visible crew/equipment: In the scene in the beginning where Will Smith chases the alien who jumps off the bridge onto the street. Will Smith jumps from the bridge onto a tour bus, then jumps on the back of a newspaper delivery van. In the passenger side of the van is a cameraman with his back towards the windshield in order to film down the side of the van as Will Smith jumps off the van.

Continuity: When J and K first get in the car (the Ford POS),the windows keep switching from up to down. Interior shots Will Smith's window is up, exterior shots his window is down.

Continuity: When Will Smith is holding the squid, watch the reflection on the alien's black eyes. Although Will Smith is standing alone, the reflection on the eyes shows two people, or - depending on the shot - one with a big hat.

Continuity: When the jeweller leaves his shop, the shop window clearly shows the reflection of the parked exterminator's van. Then you see the van being driven up the cross-street as the jeweller leaves in the taxi.  Then Edgar/bug parks the van, goes to the shop, and you can see the same reflection in the jewellery shop window.

Continuity: In the resturant scene, the jewel case containing the diamonds is to Mr Rosenburg's right and when the Arquillian asks what it is, the jewel case is to Mr Rosenburg's left.

Continuity: When the countdown timer for the destruction of Earth appears on the viewscreen, you see it count down to 59:56. There is a cut to three cast members including Will Smith and Tommy Lee Jones for a brief dialogue scene. When it cuts to Will Smith walking away you can see the clock still counting down on the screen in the background. Now it is showing the time of 59:54. The aforementioned dialogue section took noticeably longer than two seconds.

Revealing: There is a scene where Agent J is standing on a car and shoots the "Noisy Cricket" at the fleeing Edgar. The camera shot is from inside the car and just before Agent J crashes through the windshield, you see a precut area in the glass.

Continuity: After Will Smith holds the squid, the amount of slime on his jacket differs between the right and left shots.

Other: In the final scene outside the MIB headquarters, Kay opens the neuralizer and we see it open, but there is no sound. Later when Kay tells Jay that he hasn't been training a partner but a replacement, we hear the sound of the neuralizer opening and Kay tells Jay how to operate it.

Continuity: When Will Smith and the other recruits are taking their written tests, the white table first appears to be situated between the second and third men from the left. When Smith goes to the table to pull it across the room, it is much further to the right of the scene.

Factual error: This is a minor mistake, involving when Tommy Lee Jones was looking at his wife on the computer. He typed in Truro (in Cape Cod, Mass.), but when he zoomed in, it was on the lower cape; Truro is located on the upper cape near the tip.

Revealing: When J and K get into the car (a POS if memory serves) K makes a comment about J fastening his seatbelt, if you watch in the background out of J's window as they pull away there are a few people walking at an incredible rate showing that they filmed the scene at a normal speed then sped it up when put into the final cut.

Visible crew/equipment: When the rear of the truck explodes after Will Smith shoots it, the pipes that feed the scene with smoke can be seen just above the kerbstones.

Continuity: After Kay neuralizes Jay the first time, Jay 'wakes' up in a restaurant and Kay hands Jay a card. He tells him to report to that location. The address can be seen written on the back on the bottom edge of the card. Jay flips the card over to read the address and it's still on the bottom edge of the card. When flipped, the address should now be on the top edge of the card.