Trivia: Kevin Peter Hall, who plays the Predator, also appears as the pilot of the general's helicopter at the end of the film.
Trivia: Jesse Ventura was delighted to find out from the wardrobe department that his arms were 1" bigger than Arnold Schwarzenegger's. He suggested to Schwarzenegger that they measure arms, with the winner getting a bottle of champagne. Ventura lost because Schwarzenegger had told the wardrobe department to tell Ventura that his arms were bigger.
Trivia: Jesse Ventura could only carry enough blank ammunition to fire "Old Painless" for five seconds even though the props department had dramatically reduced the cyclic rate of the weapon to allow the camera to film the barrels rotating.
Trivia: Carl Weathers did not exercise with the rest of the cast while preparing for the role in the jungle. He told everyone that his awesome body was just natural, while he actually exercised while no-one was looking.
Trivia: The Predator suit weighed over 200lbs and even though Kevin Peter Hall was a large and powerful man he had to be connected to a "bungie" rig to enable him to move believably.
Trivia: Although shot in a real jungle most of the shots of Dutch and his team traversing the jungle environment had to be augmented with plants placed by the crew as the real jungle wasn't all that dense.
Trivia: When we see the predator polishing and sorting out his skull collection (before the final fight with Arnie), we see some skulls he had already cleaned, and one of them has a hole in the head (where he shot the person we see earlier). Nothing major, but it shows some nice thinking because we only see the skull for a split second.
Trivia: Only two people were injured during the filming of Predator in spite of all the explosions and gunfire, the first was director John McTiernan who broke his wrist falling from a tree but ignored the injury out of embarassment, the second was the stuntman who did the high dive off the waterfall who threw his knee out when he hit the water.
Trivia: "Old Painless" required a rather large and heavy battery pack to operate, when you see Jesse Ventura walking with the weapon it is not plugged in and consequently wouldn't operate.
Trivia: Another reason that the movie almost didn't make its deadline was because the actors kept getting sick. The film was filmed mostly in the Mexican jungle, and aside from dangerous, venomous insects, the actors were often afflicted with high fever, severe stomach ailments, and flu-like illnesses during most of the filming, causing a few of the actors to require several days of bed rest.
Trivia: Almost all the thermal vision shots were done by artificially colouring negatives shot with a regular camera as the expensive and extremely cumbersome thermal imaging camera couldn't see the difference between the temperature of the actor's bodies and the ambient temperature of the tropical jungle the film was shot in. The few shots which actually use the thermal imaging camera were done by spraying ice water all over the surrounding area and making the actors stand by a fire before filming.
Trivia: Kevin Peter Hall had to wear a custom made "cool suit" which circulated cold water to keep him cool while wearing the Predator suit in the Jungle. Even with the cool suit he could only wear the Predator suit for about 2 hours before overheating and having to be quickly but carefully extricated from the suit.
Trivia: Surprisingly, despite the excellent effects and make-up in the film, the budget approval for Predator was so low that within the very last weeks of filming, the movie was almost dropped. Arnold Schwarzenegger also had an obligation he had to keep during the last week of filming, causing him to miss 3 days.
Trivia: Anyone know who was cut from the film as the first Predator? Jean-Claude Van Damme, in a special effects suit. He quit very early on, as he didn't like being uncredited, so the design was scrapped and remade as what we know and love today.
Trivia: Fox's insurance company wouldn't allow Sonny Landham to be in the film unless he was accompanied at all times by a bodyguard, not to protect him but to protect the other members of the cast and crew from him.