Continuity mistake: As Murtagh's car pulls up behind the small pickup, a man is reaching into the bed of the truck from the left side of the truck. But as soon as Riggs steps out of the car, the man is instantly behind his truck. (00:37:25)
Visible crew/equipment: When the BMW flips over and slides across the pavement, a rope is briefly visible towing it along right before making contact with and destroying the storefront. (00:06:15)
Visible crew/equipment: On the Alba Varden, just before Riggs gets hit in the leg by a knife, a shadow from the camera, as it moves backwards, can be seen on the orange container to the right of screen. (01:42:30)
Continuity mistake: When Captain Murphy is briefing Riggs and Murtaugh on their Leo Getz assignment, a small red No Smoking sign can be seen facing outwards on the desk. But as Riggs and Murtaugh stand up to leave, notice how the sign has momentarily turned itself around to face the Captain. (00:25:55)
Other mistake: When the car blasts out the container, the pallets which the money was on, don't come out with the money.
Revealing mistake: When Leo gets his Subway sandwich, he complains that it's tuna. When he holds it up a dark red lunch meat is visible, like salami.
Other mistake: Roger intercepts Riggs and blocks the path of his truck. After agreeing to a plan, we hear Riggs driving off. But his original path is still blocked and we don't see him pass behind Murtagh, so he must have reversed direction (which seems unlikely since he's continuing his drive to the same destination). But for his truck to have headed the other way, he'd have to turn it around first, but we hear it simply drive off. (01:35:40)
Continuity mistake: When Riggs and Murtaugh are trying to find the address Leo can't quite remember, Riggs is looking through an address book. Turning the pages, he gets to a yellow bit (possibly a different section), and so goes back a page. The angle changes half-way through this page turn, and the yellow page has disappeared, replaced with a page full of text. (00:34:55)
Continuity mistake: At the end of the film when Murtaugh is holding Riggs, the position of the money keeps changing around them, yet no wind appears to be blowing.
Visible crew/equipment: There's a shadow of a crew member moving across the lighted trees when Rudd asks Rita in front of the embassy whether she understood what had happened today. (00:44:10)
Continuity mistake: In the final shoot-out Riggs shoots a guy who is looking down a ladder. We see about four exit wounds on his back, but no injury in front, neither later when Murtaugh takes a look at the corpse. (01:37:30)
Continuity mistake: In the drive-thru scene you can see that the right half of the grill and both right headlights on the wagon are gone. When they pull up at Roger's in the scene where Leo gets kidnapped the right headlight is working. (00:45:20 - 01:03:15)
Other mistake: When Riggs kills the guy who murdered his wife by dropping that cargo crate on him it's obvious the crate has no bottom and it falls around him, not least because the body's height doesn't change as the crate falls, there's no sign of impact or crushing, he just stays perfectly upright as it hits the ground. (01:39:25)
Suggested correction: This is simply not a mistake - we obviously know that the filmmakers didn't really crush an actor, but there's no visible clue of the SFX "deception."
Continuity mistake: When Riggs wins his straightjacket bet he pulls it over his head, but only because the formerly closed strap through his crotch is suddenly open. (00:08:40)
Factual error: Towards the end of the movie, Gibson shoots padlocks with his pistol to break them to get into a truck. Mythbusters has proven this cannot be done with ordinary weapons, or even much more powerful weapons.
Revealing mistake: When Riggs is holding on to the front of the tow truck, in some wider shots you see how his jacket is squeezed by the rope which ties him to the car. (00:37:00)
Continuity mistake: In the opening car chase the red BMW zips through a hotel arcade. On the right we see a guest waiting with a porter. The porter grabs a suitcase and runs towards the entrance, and the guest turns left and starts running away from the entrance. When the camera angle changes the guest is back where he was standing, but now he turns right and runs the other way. (00:03:00)
Continuity mistake: In the final scene where Riggs is in Murtaugh's arms the side shots show blood all over the left side of Riggs' face but the straight shots there is just a little on his left cheek and chin. (01:41:55)
Continuity mistake: This only for the Directors Cut edition of Lethal Weapon 2. In the added scene where Riggs charms the ladies at he Pool in the hotel where Leo is staying. Just as they wallk in to the pool area, you see a woman in a pink bikini get out of the pool almost completely. Then in the close up shot as Roger bends down to talk to someone, the woman in the pink bikini is getting out of the pool again. (00:26:30)
Continuity mistake: At the end of the opening car chase the red BMW crashes into a police car whose driver vanishes between shots. (00:06:00)
