Significant ways in which Jurassic Park the movie differed from Jurassic Park
1) In the movie, the lawyer gets gobbled up while hiding in an outhouse. In the book, he is somewhat of a hero, seemingly preventing a last-minute dinosaur infestation of the mainland.
2) In the movie, the old guy (Hammond) lives to escape. In the book, he is killed by Compys (Compsognathi) after breaking his leg. These dinosaurs did not appear in the movie at all.
3) In the movie, the suave chaos theorist played by the box-office draw survives and goes on to star in the sequel. In the book he dies, dies dies!
In short: everyone who dies in the movie lives in the book and vice versa.