Oliver Hunter

Continuity mistake: When Paige walks out to Blake in his car he kisses her. When it cuts his hand is suddenly on her chin. (00:04:55)

Mortug

Continuity mistake: When Lance and Seth Green are riding in the buggy, they are talking for a few minutes. During this time the side shot will show Lance with his arm all the way around Seth's back/shoulder. However, when the camera changed to a full shot, Lance's arms were at his side, nowhere near Seth's back or shoulder. This happened several times during this scene. (00:40:35)

Continuity mistake: When Rex slams on his brakes after Ian tells him that he met a girl online, the background outside the driver side window is a building with trees around it. The shot then switches to the passenger side. When the shot goes back to the driver's side, the background outside of the window is just trees and other shrubbery, even though the car is still at a standstill. (00:06:25)

Continuity mistake: When Carly has fallen into the road kill pit, the amount of dirt on her hands keeps changing instantly. (00:20:50)

Ssiscool ★

Continuity mistake: At the beginning of the scene when Paige and Blake are alone in the tent, there is a shot of Blake's cell phone sat atop a CD case, with the top line of the display showing the date and time and "NewVoiceMessage" below it. When the music stops and Blake runs out of the tent, the phone is seen in a different orientation on the CD case but still has the date/time as the top line. After Blake restarts the music, he then picks the phone up, which is still in its new position but no longer has the date/time displayed on the top line. (01:08:10 - 01:09:45)

Oliver Hunter ★

Continuity mistake: When Carly locks herself in the truck, the owner throws to the ground the box holding the fan belt and a few other things, right beside the driver's side of the truck. In the next exterior shot, there is nothing on the ground. (00:50:50)

Continuity mistake: Right at the start, when the woman says, "Why can't you be more like your brother?" the cereal the kid has changes position/amount between shots. (00:02:10)

Ssiscool ★

Continuity mistake: When Frank the dog is growling at the agent in the park his teeth are fine but later talking to Zed he is told he can have better dental. He smiles and his teeth are horrible. (00:23:50 - 00:31:10)

Continuity mistake: During the fight scene with Jarra, Jay is dropped into the center of some large plastic tubing, but when the camera cuts to a closer shot, Jay is now seen at the edge of the plastic tubing. (01:05:15)

Continuity mistake: When Jay is in the fight scene with Jarra and his clones, Jay jumps up two clones to get to Big Jarra, but when the camera angle changes, the Jarra clone he jumped on is gone. (01:04:35)

Continuity mistake: When Jay and Kay make their visit to Jeebs, Jay is talking to Jeebs and you see Jeebs making a statement about how his business is 'banging' and when he see Kay walk in, he points both his hands at him. The camera angle changes and Jeebes is now seen with only one hand pointing at Kay. (00:36:15)

MCKD

Continuity mistake: When Agent Jay and Tee are talking in the diner, a young guy passes behind Jay towards Tee, but disappears when the angle changes. (00:13:10)

Sacha ★

Deliberate mistake: When the trashcan opens fire on the lift with Jay & Kay in, the distance and angles mean it would, at most, be able to hit up to the edges of the rear doors. When the inside of the lift is shown, the bullets have somehow managed to reach right to the edges of the lift. (01:02:15)

Oliver Hunter ★

Continuity mistake: After Jay and Kay go to see Jeebs about the deneuralizer, Kay leaves and the bad aliens come crashing through the walls. Jay shoots Jeebs head off and, as it's growing back, he says he got shot "right in the pie-hole" (mouth). However he was facing away from Jay when he was shot and it was above the mouth area. (00:40:25)

Continuity mistake: When Agent Kay empties his guns shooting at the trashcan robot in the elevator, he throws down his guns and swings back to the roof of the elevator. When the robot moves into the elevator, the guns are nowhere to be seen. (01:03:00)

MCKD

Continuity mistake: When Agents Jay and Kay are in the elevator avoiding the garbage can robot who is shooting at them, watch their hands - they move from the wall to the roof ledge for support as the camera angle changes. (01:02:10)

MCKD

Deliberate mistake: When MIB agents exit the lift to get into the main hall of the MIB Office, the lift opens halfway up the wall and they need to go down a little platform. But when K and J return during the lockdown and face the trashcan with guns, the lift opens at floor level, so it can be conveniently peppered with bullets. (01:02:05)

Continuity mistake: In the scene at the lockers in Grand Central Station, Agent Kay takes his watch, an illuminated Hamilton digital, back from the little animals living there. In one shot, Agent Jay puts an analogue watch in the locker as a replacement, but in the next shot it is the same old Hamilton digital owned by Agent K. (This is mentioned in the DVD Audio Commentary with Barry Sonnenfeld). (00:51:15)

Visible crew/equipment: When Émilien is chasing after the Ninjas on foot, they jump from a bridge onto the top of an orange lorry. The orange crash mats that the 'Ninjas' land on are visible in the overhead shots. (00:47:35)

Oliver Hunter ★

Revealing mistake: When Daniel is being chased along the rail tracks, both the Peugeot and the Mitsubishis' wheels change from road wheels to train wheels (with fake tyres on) and then back again when they move back onto the gravel. Clever cars... (01:11:05)