More Hitchhiker: Wired breaks down the delta between the book and the movie:
The studio exaggerated a romance between Dent and Trillian (Zooey Deschanel) to offset the wackiness of the story line. Ugh. But the sequence involving an alien-filled DMV office and an opening number with singing dolphins that thank Earthlings "for all the fishes" - it's all Adams.I thought Zooey was cute, so I'm glad they buffed her role up.
And in other news, Jamison liked it, with some small misgivings. And that's good enough for me.