Revealing mistake: Mac and Dillon go after the Predator. The Predator is sitting in a tree, and Mac points him out to Dillon. They both agree that they see it and take position. Mac crawls underneath the alien and is killed by his laser. The Predator then sees Dillon and lasers his arm off. Dillon's arm falls to the ground with the gun firing. Quickly Dillon turns and reaches for the machine gun around his neck. When he turns you clearly see his bloody right stump and his right arm sticking out the bottom of his jacket. [Note: As far as I can work out, this has been cunningly edited out of the UK DVD version].
Continuity mistake: After Mac has stabbed the scorpion that was on Dillon's back, he puts on a box and crushes it with his boot. You see a clear picture before he crushes it and then after he lifts his boot away. It is facing a completely different direction than before he stands on it. (00:32:25)
Revealing mistake: In the scene where Dutch is being chased by the Predator, near the end, he jumps into a waterfall. When you see him take a high-dive, it is archive footage of a different person, filmed on a different camera. When it cuts straight back to Arnie, you can see that it was a completely different place as well. When you know to look for it, this is really obvious. (01:17:05)
Continuity mistake: When the Predator blasts free of the net and his laser blows off a tree limb; in the first shot you can see the limb is hollow as it is shot off [and I for one have never heard of a hollow tree, but even if they do exist...] as the free limb swings down toward Poncho, you can see that it is no longer hollow, but completely solid. (01:06:40)
Factual error: The predator enters the compound and picks up the scorpion. The silhouette of the scorpion changes from bright to dark, showing a drop in temperature. But scorpions are cold blooded animals who have an ambient temperature. The predator should never have seen it at all.Willem Oosterhof
Factual error: The heat from Dutch's body would warm the mud up in a matter of seconds (tested by the Mythbusters). It doesn't even cover all of his skin or his eyes. And the Predator isn't filtering his input for only large heat sources. His normal vision tracks in on a rat hiding just above Dutch.Fireball
Continuity mistake: Near the end of the film, Arnold is lying in wait for the Predator after he lights the bonfire. It is pitch-black, except for the moonlight and the fire. But in the shot when the Predator jumps down through the trees, the skyline is brighter - almost early evening in brightness.
Continuity mistake: In the scene where the female prisoner falls to the ground and pretends to be hurt, then throws leaves in the soldier's face and tries to escape. She is stopped by another soldier, standing in her path with a gun in her face. The sequence with the gun pointed at her head is filmed in two shots. One looking up at the soldier holding the gun, the other with the gun hovering in her face. Every time it changes between these two camera angles, we find the soldier's hands in two completely different positions on the gun he is holding.
Factual error: In the scene where Dutch is making his improvised explosive arrows we get a close up of him dismantling a 40 mm High explosive grenade and dumping the propellant out onto a large leaf. Way to much powder came out. An actual 40 mm has only about an amount equal to a sewing thimble full.
Continuity mistake: As Dutch climbs out of the water he crawls through mud. He looks back at the pursuing Predator and crawls backward through the mud. Even with all this crawling there is no way that he would have been covered head to toe in mud. If you look closely every little nook and cranny is full of mud, he would have had to dunk his entire body in a mud pit to accomplish this. (01:19:25)
Visible crew/equipment: During the final battle, shortly after Dutch runs by a plant that moves and catches the Predator's eye, watch as the Predator takes a few strides from rock to rock. When he jumps down off the last rock you can see a cable above his head helping him make his jump. This same cable can also be seen from a different shot about ten seconds later when Dutch runs into the Predator. (01:29:45)