Kurt Russell turned down the role of Alan Grant due to salary demands.
Malcolm distracting the dinosaur with a flare was included at Jeff Goldblum's suggestion, as he felt a heroic action was better than going by the script, where like Gennaro, Malcolm would get scared and run away.
James Cameron claims that he wanted to make the film, but the rights were bought hours before he could bid. His version would have been more violent, but he agrees that it wouldn't be better.
A study by Western Australia's Murdoch University concluded that DNA cannot survive more than 6.8 million years - a finding that effectively rules out the film's method of replicating dinosaurs. The new study, published in the Proceedings of the Royal Society B in 2012, was based on carbon-dating bones from the moa, an extinct New Zealand bird. The researchers found that the DNA from the bones halved after about 521 years when stored at 13.1 degrees. At minus five degrees, the final fragments of DNA in a bone would disappear after 6.8 million years.
This was Richard Attenborough's first acting role since The Human Factor (1979) fourteen years earlier.
Laura Dern's mother Diane Ladd also starred in a dinosaur film released in 1993. She played Dr. Jane Tiptree in Carnosaur (1993).
The T-Rex makes four appearances in the film.
Unlike Lex, Grant and Tim never lose their fascination with dinosaurs, even after they've seen what they can do, e.g. watching the T-Rex feed on a Gallimimus, while Lex only wants to leave, etc.
Although composed by John Williams, his score for Jurassic Park is not often counted among Williams' more famous film scores. In 2013, for the 20th anniversary of the film, Williams released an album that restored 14 minutes of music cut from the original film.
Jurassic Park (1993) was the movie where photo-real visual effects saw audiences jaws drop.
The T-Rex makes water ripple whenever it approaches. There is a similar scene at the Visitors Centre when Lex sees the Raptors coming and the jelly in her spoon starts shaking because she's trembling.