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the crew was required to have safety meetings about the T. Rex. it weighed 12,000lbs, and was extremely powerful. they used flashing lights to announce when it was about to come on, to alert the crew, because if you stood next to it and the head went by at speed, it felt like a bus going by.
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real Velociraptors were actually barely 1.6 feet tall, much smaller than the ones depicted in the movie. shortly after the movie release, a dinosaur was discovered in Utah that was almost identical to the Velociraptor in the movie. although the idea was finally scrapped, one of the proposed names for the new species was "Utahraptor spielbergi".
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the Dilophosaurus' fictitious venom-spitting ability and its neck-frill became so iconic that almost every other appearance of the animal in popular media, including many Dilophosaurus toys feature at least one or both of these traits
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Goldblum and Dern went from flirting on set to being engaged for 2 years. Richard Attenborough got between them and they broke up
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the Triceratops dung didn't smell at all. it was made of clay, mud, and straw. and drizzled in honey and papaya juice so flies would swarm near it
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the sound of the T. Rex's footsteps was created using cut sequoias crashing to the ground
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effects wizard Stan Winston
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Spielberg is estimated to have made around $250 mil on this film
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James Cameron has stated that he wanted to make this movie, but the rights were bought "a few hours" before he could bid. upon seeing this movie, Cameron realized that Steven Spielberg was the better choice to direct it, as his version would've been much more violent ("Aliens (1986) with dinosaurs") which "wouldn't have been fair" to children, who relate to dinosaurs. the visual effects were directly influenced by Cameron's Terminator 2: Judgment Day.
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Ariana Richards' audition consisted of standing in front of a camera and screaming wildly. Steven Spielberg "wanted to see how she could show fear." (i feel like there had to be more to the audition)
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adult velociraptors are first seen 1hr 43min into the movie
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the scene with the under the weather Triceratops ends without any clear explanation as to why the animal is sick. Michael Crichton's original novel and the screenplay, however, include an explanation: the Stegosaurus/Triceratops lacked suitable teeth for grinding food, and so, like birds, would swallow rocks and use them as gizzard stones. in the digestive tract, these rocks would grind the food to aid in digestion. after six weeks, the rocks would become too smooth to be useful, and the animal would regurgitate them. when finding and eating new rocks to use, the animal would also swallow West Indian Lilac berries. the fact that the berries and stones are regurgitated explains why Ellie never finds traces of them in the poo pile
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Universal Pictures paid Michael Crichton $2 million for the rights to his novel before it was even published
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when Grant feeds the Brachiosaur, the head was twelve feet high, on a dolly, so it could move in on wheels, and the actors and actress would have something to which to react. the Brachiosaur snot was methacryl; Steven Spielberg insisted it be green, if it has a cold. Ariana Richards gets asked about that scene in every Jurassic Park interview; she refuses to talk about it anymore. the sounds made by the Brachiosaurs were a combination of whale and donkey sounds
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all of the cast were given a Raptor model, signed by director Steven Spielberg as a gift. it looked very frightening, and Ariana Richards has it in her house to shock anyone coming in, like a guard at the gate. Jeff Goldblum's model has a prime spot in his house, and is a cherished object. Laura Dern put her Raptor model in her son's room near his crib
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filming wrapped 12 days ahead of schedule. then there was a ton to do in post production (obviously)