I finished the book today. I especially enjoyed the introductions and the "author notes". Much more than the "actual" fairytale. Although the fairytale was amusing, the author notes is what really made the book funny.
I even enjoyed the (extremely long) introductions (I have the 30th anniversary edition so tehre were two of them)
I can't say it made me want to see the movie, even though I'm sure it's very enjoyable.