I first read Gone Girl, by Gillian Flynn, back in October 2012, and I remember being shocked by all the twists and turns in the novel. I didn't review the movie, because I saw it after it came out in theaters {generally I see movies at pre-screenings}, but it was very good, and seemed to follow the movie's story very closely.
You can see a more complete list of book-to-movie changes here, but here's some that I did notice:
(heads up .... a few SPOILERS are ahead, so skip those if you haven't seen the movie OR read the book yet)
- The book is written in first-person point-of-view (POV) - first from Nick's POV, then from Amy's
- A few of the minor characters in the book were cut out of the movie
- The way that Amy (SPOILER!!!) sets up the murder scene to frame Nick
- We learn a bit more about Amy's crazy past (aka, that she is CRAZYPANTS and has been for a while) in the book than in the movie
- The way that (SPOILER!!!) Amy kills Desi



