When the T-Rex comes through the glass roof of the Ford Explorer in the first attack, the glass was not meant to break, producing the noticeably genuine screams from the children.
The T-rex occasionally malfunctioned, due to the rain. Producer Kathleen Kennedy recalls, "The T. rex went into the heebie-jeebies sometimes. Scared the crap out of us. We'd be, like, eating lunch, and all of a sudden a T-rex would come alive. At first we didn't know what was happening, and then we realized it was the rain. You'd hear people start screaming."
Both the film and the book generated so much interest in dinosaurs that the study of paleontology has had a record increase in students.
The Tyrannosaurus' roars were a combination of dog, penguin, tiger, alligator, and elephant sounds.
The crew had to have safety meetings about the T-Rex; it weighed 12,000 pounds 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.
The glass of water sitting on the dash of the Ford Explorer was made to ripple using a guitar string that was attached to the underside of the dash beneath the glass.
Steven Spielberg wanted the velociraptors to be about 10 feet tall, which was taller than they were known to be. During filming, paleontologists uncovered 10-foot-tall specimens of raptors called Utahraptors
In 2005, paleontologist Dr Mary Schweitzer discovered red blood cells and soft tissue in the fossilized bones of a T-Rex, meaning dinosaur cloning may become a reality someday.
When the Utahraptor was discovered right before the film's release, which had a similar height to the Raptors depicted in the film, Stan Winston joked, "We made it, then they discovered it".
During the scenes with the T-Rex, Steven Spielberg would roar like one through the megaphone. The cast cracked up whenever he did that.
While discussing chaos theory, Ian Malcolm (Jeff Goldblum) shamelessly flirts with Ellie Sattler (Laura Dern). After meeting on this film, the two actors began a romantic relationship, and were engaged for two years before breaking up.
There are only 15 minutes of actual dinosaur footage in the film: 9 minutes are Stan Winston's animatronics, 6 minutes of it is ILM's CGI.
The Mr DNA cartoon was Steven Spielberg's way of condensing much of the novel's exposition into a few minutes.
The Dilophosaurus never walks because it was difficult to get the weight shifting and the movement right. A trench was cut into the floor of the set for the puppeteers but Steven Spielberg elected to have it just appear instead to make the scene more ominous and surprising. He also wanted more water for the scene coming down the hillside with every fire hydrant going in the studio until they ran out. Michael Lantieri joked every now and then "just splash him with something so he feels there's more water". To this day, Spielberg still feels that scene needed more water. Wayne Knight thought it a miserable scene to shoot, sliding down things, covered in mud, soaking wet, he was 327 lbs and he could barely walk, but he loved watching it.
Credits to Jurassic Park Wiki - Wikia for additional information and images.
Credits to IMDb for information references.
