hehe.... The Criterion disc for F&L is amazing if you like the movie. The extra features with Hunter S. Thompson are insane - which I guess is apt considering how much drugs this man has ingested over the years.
Oddly enough, Mr. Thompson goes into pretty good depth on why he didn't really like the movie, and wasn't a huge fan of Gilliam. He didn't hate it, but thought it wasn't very true to the book. Although, he pauses several times throughout the commentary to bark, screech, and howl into the microphone, so it's entirely possible he doesn't even remember that he actually wrote the book!