Continuity: During the car chase involving the car driven by the Chinese guy, Murtaugh, and the mobile home, the two cars slide against each other and the right wing mirror on Murtaugh's car is completely wrecked. Once the two cars are separated the wing mirror has miraculously repaired itself. The left wing mirror also does a disappearing / reappearing trick.

Deliberate "mistake": During the big gun battle right before the last fight scene, Riggs is shown driving a forklift, and knocking over some barrels on top of Jet Li's character. When the forklift does the 180 degree turn, you can CLEARLY see that it is not Mel Gibson, but is an Asian stunt man.  He must have been the only stunt man on the set who could drive a forklift.

Continuity: In the scene near the end of the film when Murtaugh shoots at Jet Li and mistakenly kills the last of the four fathers, you can clearly hear an empty shell casing hit the floor, although he is using a revolver, which do not spit out the empty shells as they are fired.

Continuity: In the scene where Mel Gibson And Danny Glover drive a car through an office you see Mel floor the car in one shot, and when they show a view of the car you can see the brake lights are on.

Revealing: The shark Joe Pesci catches is unbelievably fake - you can even see the seams.

Continuity: At the end of the movie when Riggs, Murtaugh and the other two cops enter the garage where the Triad chief is buying the four fathers' freedom whe can clearly hear the hard rain outside, but the car that they're driving is completely dry - maybe they had a very big umbrella!

Continuity: More geographical problems: During the scene filmed on a supposed L.A. highway where Mel is on a table loosely connected to a semi, the Luxor hotel in Las Vegas is seen in the background.

Continuity: Near the end when Butters is shot, Danny Glover is holding Butters' head up, you can see Glover's tie down on his chest and in the next scene it's over his shoulder, and then the tie is back on his chest in the next scene.

Continuity: When Riggs is on the table and jumps into the moving car, the table is run over by another car. A few seconds later you can clearly see the table still attatched to the plastic.