Fake Brit: American Arliss Howard as Peter Ludlow.
Money, Dear Boy: Julianne Moore's stated reason for doing the film, as she was trying to pay off the exorbitant divorce settlement that had been awarded to her ex-husband.
Refitted for Sequel: Both compy attack scenes (the opening sequence and Dieter's death) are adapted from the opening of the first Jurassic Park book, as well as the "stuck behind a waterfall being licked by a T. rex" scene (involving Tim and Lex in the novel).
Science Marches On: The Compsognathus are portrayed with two fingers, but it is now believed to have possessed the usual three.
Take That: A double-edged one to the feud between paleontologist consultant Dr. Jack Horner and his rival, Dr. Robert Bakker, regarding whether T. rex was a scavenger or an active hunter. In the film, a rex eats Burke, an Expy of Bakker. The first thing Bakker did upon seeing this was to call Horner up and say "See? I told you T. rex was a hunter."
Regarding Dieter Stark's death, Spielberg himself said it was deserved since Peter Stormare, the actor who portrayed Stark, had previously played Gaear Grimsrud in Fargo, the perpetrator of the now infamous wood-chipper scene.
Once Spielberg was confirmed as director, he insisted in expanding the rex's final rampage in San Diego. It is unclear if the movie would even have a final act in the continent if he wasn't in, or the captured rex was just going to be a Sequel Hook.
Originally, Ajay and some of the InGen men survived the raptors attack and made it to the abandoned city, where they were killed by Pteranodons. They survived long enough to call for a helicopter that was attacked and brought down as well. Technical challenges reduced the Pteranodons' role to a cameo in the end, but there was at least one animatronic head built. The helicopter attack was later incoporated into Jurassic World.
In a Deleted Scene, the boatmen were revealed to be killed by raptors that had sneaked into the ship.
In the scripted end, Hammond dies and Malcolm attends the scattering of his ashes into the sea. The very final scene is of him using a pair of binoculars to watch a flock of Pteranodons leaving the island. The latter scene was incorporated into the third movie.