Watchmen

Director: Zack Snyder
TRT: 162 min.
Year-2009

Based upon the graphic novel written by Alan Moore and illustrated by Dave Gibbions, “Watchmen” is set in an alternate universe where Richard Nixon has forced all costumed superheroes into retirement. When one them, The Comedian, is murdered, a rebellion vigilante named Rorschach sets out to find who is responsible for his death. The movie is directed by Zack Snyder.
An article I found that talks about the difference between the book and movie is from the AV Club. It is titled, “Book vs. Film: Watchmen.” in the book, the story has a comic within a comic called “The Black Freighter.” in the movie, Zack Snyder has cut this storyline out completely except for a second or two when we see the kid by the newsstand reading the comic.
Snyder also changed scenes from the book in the movie. In the movie, Dr. Manhattan replicated himself in the bedroom with Silk Spectre while they are hooking up. This scene happened in the book as well but it has been altered by Snyder. In the book, she is alarmed and appalled in a way that he did this. Clearly, he has never tried this with her before. In the movie tho, Dr. Manhattan has done this before with her. Seeing that she isn’t happy, he goes “I thought you liked this.”
Another difference between the book and movie is the dialogue. The dialogue is altered between the book and movie. For example: Rorschach answers the question, “We got a jail full of guys out here who hate your guts. What in hell do you got?” with “Your hands, my pleasure” instead of “Your hands, my perspective.”
Also in Watchmen, the ending of the movie is changed from the book. In the book, the villain, Ozymandias uses Dr. Manhattan to unleash an alien into New York City which kills hundreds and hundreds of people. In the Movie, Snyder has it that a bomb goes off and does. Snyder did this to make the film more relevant and realistic.
I have read the graphic novel myself. I can see why Snyder would change the things around like he did. The book was very detailed and drawn out. It also had a lot of sub-plots. To put this all in a film, would be implausible. Snyder stayed very faithful to the book as best as he can and did a good job.