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.

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 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.

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 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.

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.

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: 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.

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: 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.

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.

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: When the cat in on the table in the diner, the word "ORION" on the cat's collar is in normal capitalized block lettering. But when the cat is on the table in the morgue, the word "ORION" is in calligraphy. Also, the colour of the cat's collar seems to change between these two points.

Revealing: When K and J buy the "hotsheets" (newspapers) to look for information, the clerk who K gives the money to briefly looks at the camera.

Continuity: In the beginning, when K shoots the Mexican-Alien, one of the cops gets covered with blue slime all over his face and hat. Watch the right side of the hat: The length of the slime differs between the front and back shots. It's more seen when the scene is about to end and the slime starts to fall down in the front shot, but stays still in the back one.

Continuity: Throughout the whole movie it is summer. Green trees with leaves, green grass, etc. After the scene where Will Smith is deciding to become a Man in Black (summer), there is a shot of the Bug Mobile driven by Edgar where it is obviously winter. A wide shot of Manhattan with steam coming out of the tops of some of the buildings, and some trees without leaves in the background (winter). Then in the next scene and those following it is back to summer.