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.
Suggested correction: It's not clear how much powder came out because it's too dark to see. It could be assumed that it was a lot but it could equally have been not much that took some time, and turning of the shell, to come out. That said, a standard low-velocity, launcher-fired 40 mm grenades generally have explosive loads of 30-50 grams.
Revealing mistake: When Bill Duke picks the scorpion off Carl Weathers' shoulder with a knife, you can blatantly see some gum or similar that's been used to stick the scorpion onto the tip of the knife. Even if it's meant to be Bill Duke's gum, it's not on the tip of the knife before he stabs it.
Suggested correction: It isn't gum, it's literally the scorpion's guts.
There are no guts in the scorpion's body, so it's obviously some material to stick scorpion to the tip of the knife, and it's blatantly visible in the close shot.
It's the abdominal fluid. It probably is gum in real life but if you kill an insect you will find it has a gum-like fluid in its abdomen.
Audio problem: When Anna hits Poncho and takes off running, Arnie "whistles" at Hawkins with his mouth closed and the camera is looking directly at him when it happens. (00:41:05)
Suggested correction: The whistle is a tongue whistle. The tongue is curved via the teeth and the lips need to be almost closed to make the air rush out in that manner. It's sharper than a regular whistle due to this.
Other mistake: When the Predator sees Billy on the log bridge, there is a cold blotch in the middle of Billy's chest. He's not wearing anything that would make such a hole in his heat signature - it should be the same color as the rest of his torso. It doesn't even match up with the cut he made across his chest; the cut starts much higher than the blotch and the blotch is irregularly shaped, not indicating the smooth line of a cut. (01:15:20)
Suggested correction: The cold area is the blood running from his wound. It is cooling down on contract with the air.
Other mistake: The time of the chopper arrival for rescue (after the village attack) is said to be 09:30 but the voice on the radio says 10:30.
Suggested correction: Maybe the pick-up time changed. When Dillon (Red Fox) calls Blazer One for extraction (after the village fight and Blane's death), he's told "next contact 9:30." Dillon confirms pick-up at 10:30 hours.
Plot hole: After Blaine gets killed and the group hose down the forest, Poncho goes and checks for the enemy. He comes back and says he didn't find tracks or blood "We hit NOTHINGGG." Now, while he would be looking for red blood, he certainly should have noticed at least the glowing Predator blood (made from glow stick fluid - widely used by the military and public alike at the time) easily visible on the large leaf, and deduced that came from something - perhaps the enemy soldier had a glow stick.
Suggested correction: This isn't a plot hole. The plot of the movie isn't broken because of this. It's an assumption that he "should have noticed" the predator blood but he might not have. And if he had, and had discounted it, it would only be a character error not to have mentioned it.
A plot hole doesn't strictly need to "break" the plot to count as a plot hole. The term most often refers to instances when a film contradicts its own sense of internal logic. For example, something happening that contradicts something else that was already established, vital information being left out, or a character acting way out of character for the benefit of the plot. In this case, this absolutely could count as a plot hole.
Character mistake: When Mac describes what he saw after Blaine was killed, he states that he "capped off 200 rounds with the minigun." At the rate the minigun fires, and the length of time Mac was shooting, he fired at least 10 times that amount. Perhaps he meant to say "capped off 2000 rounds." This adds to another mistake: the ammo pack Blaine carried only holds 500 rounds but much more than that is fired during the course of the film.
Suggested correction: He actually says "capped off 20 rounds, in the minigun...full pack" just the word spacing is a bit odd. 20 rounds refers to his normal gun which ran out of ammo quickly.
No, he says "capped off 200 rounds." I've just watched it with subtitles on. What I heard (200) matched with the subs.
