Just seeing this. BOOK SPOILERS.

Some complaints about the ending is that Boney should have kept working on the case when she knew that Amy was a murderer. The complaint is that it was simply the right thing to do. To address this, let me just say that I think that Gillian Flynn (author of book and movie) made some improvements that made for a better movie. For instance, Detective Boney was WAY more likable in the movie. Her character was smart and at times, as a viewer, I found myself siding with her during the discussions with Nick.

Well in the book, she was not nearly as likable. I honestly didn't expect her to help out, as she was embarrassed enough by the whole ordeal, and the feds had taken the case. BUT on top of this in the book, Boney found that Amy had covered her tracks extremely well. She had saved some of her long hair (presumably in a plastic bag before/during the hair dye/cut process). She had left hairs in the trunk of Desi's car and rolled in the back of it, so that her dead skin cells were all over the trunk. Also, there were no video cameras in the lakehouse, so that was not a problem at all. Let's remember that the cameras did make for some intense scenes in the movie, so I'm glad they added them.

Another part that is often brought up is that Amy had no head wound. This was a mistake for sure. In the book, she does not draw the blood. She cuts the wound with a box cutter and spews blood everywhere. Therefore, she does have a wound consistent with that type of injury and battle with Desi in the house.

I also want to address the "I'm a cool girl" stuff. The movie referenced it, but this was a HUGE part of the book. In the end, Nick LOVED Amy's act. It was an act, but he had to have known. And when she told him in the end that another girl wouldn't be enough for him, she was right. Nick loved the thrill of Amy. Yes she was a killer, but this just made her more exciting. The pregnancy was almost a convenient excuse to stay with her, but at the same time, he really couldn't trust this woman to raise his biological child.

The book also has lots of great stuff about the tug-o-war they played with each other when they returned. She had saved evidence of him poisoning her (which she actually did to herself), but he found it (in a bag of green beans in the back of the freezer) and threw it out. It's a weird story, but pretty fun.

Finally, the pregnancy announcement came much later in the book. He had actually written an entire book about what a crazy bitch she was. He didn't care if he couldn't entirely prove it because he knew that the story was believable enough with the info he had, and that at least some people would believe it was entirely possible. Unfortunately for Nick, Amy knew he was up to something when he was writing the book because he had never worked so diligently in his life. She wrote a book at the same time, simply titled, "Amazing." When he told her about his book, she dropped the pregnancy bomb, had him delete his book, and began the process of releasing her amazing story.

I can cover more later. Going to see another movie.