I read the book first, and got excited about the movie coming out. Like most other adaptations, they can't put every single detail into the movie, and the one thing that I really wanted to see was one of those things.
There was a dino that had chameleon genes, so it was able to change color to match the environment (in case you weren't aware). How great would that've been on the big screen? Other than that, it was a pretty good movie with a lot of the same well-developed characters and action that you'd expect from a Crichton/Spielberg movie.