Oh yes it happens that to me too.
When you first enjoy the book, sometimes don't want to see it somewhat "distorted" by a movie, or, simply, the book stands by itself in your mind.
Books can be really powerful, mind stimulating.
I like the special edition od the dvd because it features two or three great documentaries.
One is about zoetrope, created by Francis Ford Coppola. Beautiful Docu.
And another talks about cutting hair and the reactions, the feels, and it actually shows the moments when the actors, men and women, have their hair shaved.
It's funny and a little bit weird. But funny, interesting, definitely.
This is a brief, funny link
http://io9.com/305465/must-see-thx-1138