Just start a list of the differences between the book and the movie and see for yourself.
1. Ford became black.
2. Zaphod has ONE BLOODY HEAD.
3. Trillian NEVER LOVED ARTHUR.
4. The vorgon ships were yellow.
5. HHGG never was intended to have plenty of space battles
...
I feel like I just saw the corpse of poor Douglas Adams ripped before my own eyes and could do nothing about it.
Edit: Yes, thank you, Seth. I corrected the link. You probably see how upset I am: I couldn't even get a url command right!
