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Trivia
The plot of Predator 2 underwent a few changes in its earliest stages. The role of Gary Busey's character 'Keyes' was actually intended to be Dutch, Arnold Schwarzenegger's character from the first film. Arnold was very outspoken against the script of Predator 2, and felt that taking it into the city was a bad idea. He declined filling the role. Hence, Peter Keyes was created. Arnold was approached one more time, to be Keyes' assistant (a role played by Adam Baldwin), but his response was the same as the first time: no way. See more...
Continuity: At the end of the fight in the slaughter house, Lt. Harrigan scrambles up a ladder and goes onto the roof with the predator in hot pursuit. A few moments later, Harrigan slams into the predator and they both fall off the roof. Suddenly, they are about 30 stories up dangling from a ledge. The slaughter house wasn't 30 stories tall...it wasn't even three stories!
Revealing: When the subway train slams on the brakes, the camera cuts to a shot showing the sparks coming off the wheels as the train is slowing down. If you look at the wheels carefully, you can see that the train is already stationery, and the camera is panning down the train to give the impression its slowing down.
Continuity: At the penthouse, the Predator lifts one of the Jamaicans on his wrist blades. Another Jamaican turns to see his friend dangling in the air with a claw sticking through his torso. In the next shot from the Predator's POV, the Jamaican is facing as before and still shooting at the wall like he didn't notice. After that, it shows the same man turning in an arc that should show the Predator, but it and the impaled man have disappeared entirely.
Plot hole: When Harrigan and Captain Pilgrim leave the head Captain's office after being told not to impede Agent Keys' investigation, Harrigan then spots Keys and goes and roughs him up, shouting and generally making a nuisance of himself. Pilgrim was only just behind him. Harrigan's actions have caused everyone else to be quiet, so it's not as if Pilgrim doesn't know that Harrigan isn't manhandling Keys, yet he does nothing to intervene, especially in light of the meeting the pair of them just left.
Deliberate "mistake": When King Willie is confronted by the Predator in the ally the Predator approaches him cloaked stepping through the puddle of water. You can see his footsteps causing the water to splash up. However, you can see the water splash up and go through his foot. The Predator is only cloaked, not intangible so the water should have splashed upon his foot, not go through. Water against his foot would be visible too, even though he is cloaked.
Continuity: At the start of the film, Glover's character blows away the Colombians with a shotgun outside their drug den. Immediately afterwards we're shown the Predators POV (in thermal vision) - looking directly down at their bodies, which show up a greenish color. This would indicate their body temperatures dropped to a much lower level impossibly fast.
Visible crew/equipment: When Jerry is fighting the Predator in the subway car, watch closely behind him when he runs out of ammo. He bends over to pick up a knife, and you can see two distinct shadows on the wall in the strobing light. One is his, and the other belongs to the camera man standing a few feet to the side.
Revealing: When the predator fires his plasma caster in the slaughterhouse scene, you can see that the simple laser blast has been replaced by a Chinese sparkling firework on a string. In the original "Predator" you could see this same effect on a string but it was not nearly as spectacular and easier to miss.






