Harrison Ford once turned down the male lead role, and William Hurt turned it down without even reading the script.
There was originally a shot of a child riding a triceratops, and the special effects artists spent a year working on it, but it was eventually cut because Spielberg felt it would affect the pacing of the film.
Dr. Hammond is Richard Attenborough's first film role in fifteen years.
The little dinosaur that broke out of the egg was originally set to be a Triceratops, but was finally replaced by a velociraptor (the breed that later chased the kids in the kitchen).
In the first draft of the screenplay, Dr. Hammond was left on the island.
Many mistakes in the film ended up being computer-edited, including making the stuntman's face look more like an actor, and in one scene the Ford Explorer was completely computer-generated.
The part about the T-Rex at the end of the film was added because both the production team and composer John Williams believed that the T-Rex was the hero of the film. The original ending was that the skeleton of the Tyrannosaurus rex fell and trapped the velociraptor. In the end, it was changed to a real Tyrannosaurus rex and two raptors were destroyed.
To simulate the movements of the chicken-like dragon, digital artists put their hands on their chests and ran along a section of road with obstacles.
After the shooting, Spielberg was quite reassured about the film, and he handed over the post-production to George Lucas, and immediately devoted himself to the shooting of "Schindler's List".
When Ariana Richards learned that her character was not made into a doll (Kenner made a total of 6 characters), she was very sad and reportedly cried.
Arena Richards developed a strong interest in dinosaurs after filming the film, and over the following summer she assisted Jack Horner, the film's paleontology consultant and the source of Dr. Grant's image, in Montana. Dinosaur excavation work.
The film held the record for the highest-grossing film until 1997's "Titanic."
In the film, the sound of Tyrannosaurus rex biting at the Gallimorph is actually the sound of a dog biting a toy.
Both the film and the original novel sparked a climax for students to learn about paleontology, but it was short-lived, making the climax a record.
Universal paid $2 million for the rights to the original novel before it was published.
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