Plot hole: Before Riggs, Murtaugh, and Rianne enter the disco after they have killed or chased away their torturers, a man is casually leaning at the bar, with his hands folded in front and moving with the music. When the three protagonists come running through the door he immediately turns around and points a gun at them which apparently he was holding in his hand. One should expect that, in a public disco, even the bad guys keep their guns somewhat better hidden than just in their folded hands when they are not aware of any immediate danger. Furthermore, even the guests close to the bar don't hear the shot when Riggs shoots that guy, even though the music is not loud enough to cover the gunshot. (01:25:20)NancyFelix
Revealing mistake: In one of the first scenes of the movie you see Riggs in his trailer. He walks out of bed smoking a cigarette and taking a beer. When he takes his first drink of the beer some fluid is spilled. If you look at it, it is not beer. It's probably water, but definitely not beer. (00:07:00)
Other mistake: Just after Danny Glover's shot the guy by the pool, Mel Gibson goes to handle the two girls. We hear all the exchanges between him and them offscreen, such as "don't move or I'll break your arms", etc., ending with him saying "Got 'em", and we hear a pair of handcuffs click. When we see the girls, they're either side of a tree, with the camera-side cuffs on a wrist each. But we only heard one set of cuffs (all while off-screen, so there's no reason we wouldn't have heard another set go on), and with only one set on, there's nothing to stop them running away. (00:40:20)Jon Sandys
Factual error: Murtagh's picture shows him with a 173rd Airborne patch on his sleeve, and he later says his friend Hunsaker was wounded in 1965 in the Ia Drang in Vietnam. However, the 173rd Airborne was fighting at Bien Hoa at the time, which is hundreds of miles south of the Ia Drang. Although Murtagh may have been transferred before the picture was taken, it is highly unlikely that someone who "took a bayonet to the lung" would return to active duty so fast.
Audio problem: Right after Riggs handcuffs the suicidal man, the next shot shows Murtaugh saying "oh no" but his lips don't move.
Continuity mistake: When Hunsaker is talking to Murtaugh in his house, the shadows outside dramatically change throughout the scene. First the sun is beating down on Riggs from the right (over the ocean), then from the left leaving Riggs under a bunch of shadows from the tree. This constantly changes throughout the scene.
Revealing mistake: Early in the scene where the exchange for Murtaugh and his daughter is taking place in the desert, there are some aerial shots of a helicopter approaching the exchange site. The blades of the other helicopter, that is filming the aerial shot, can been seen at the top of the frame. (01:18:05)
Continuity mistake: When Riggs is working undercover at a Christmas tree lot sampling cocaine, he agrees to do business with the dealers. After one of them quotes a price, Riggs sits there looking pleasantly surprised. At this point, note how the sky behind his right shoulder is mostly overcast. Seconds later, Riggs shakes his head in agreement and reaches for his wallet - but by now mostly all of the cloud cover has vanished (as if minutes have passed by). (00:17:10)ryguy_1983
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