JP: I'd say the movie did the whole Main Road Attack sequence a lot better than the book did, actually. In the book, the attack is just so fast. It's intense, but it happens, then it's over and done. You don't get to truly appreciate the danger and power of the Tyrannosaurus, what an awesome moment this is: the first time a T. rex is roaming the Earth cage-free. In the movie, the attack is so much more dramatic.
TLW: I think the movie does a better job at isolation. The island does not really feel like a tropical island at all. The only time you realize that it is a tropical island is when looking at it from the beach or from the sea. It kind of reminds me of Chief Martin Brody's line from "Jaws" - of course another Spielberg film - "It's only an island if you look at it from the water". Indeed, the entire island as it is represented in the film and in the concept stage looks more like a mainland than anything else. The mountains go off into the distance, with misty clouds and other landscapes following. The first thing we are described when Dr. Ian Malcolm's team arrives on Isla Sorna in Michael Crichton's book is the volcanic lip surrounding the island. In the book, we are given set locations, and constant reminders that this entire experience is contained. We are constantly being reminded that we are on an island. Not so much with the film. The film works completely on the theme of lack of containment. Catch a T. rex and put him in a cage? He breaks out! This whole constant theme of containment and breaking free, then attempting to contain again, only to once again break free is done, dare I say, even better in the movies than it is in the books! No doubt, Crichton makes a masterful case for Complexity Theory and other mathematical theorems that intricately explain the reason Jurassic Park fails in the first book, but where the theme of control and containment comes in, that is all Spielberg.
JP///: The Aviary scene. I liked it much better in the movie. It felt all around creepier and more foreboding.