The movie does better with the "green light" at the end of Daisy's dock which Gatsby watches from his house and reaches for. The green light in both movie an book becomes Gatsby's dream, but it is far, unobtainable, in the distance. While the movie puts forth the idea that when Gatsby and Daisy cannot see the light, he has lost something among many things he sees as magic, it tends to downplay the idea that Gatsby has but one dream and that he has done all for Daisy, and like the green light, she is an unobtainable dream.
The final words of the film are straight from the novel, but it felt as if something were missing to me. It dawned on me that the last part of the film had simplified the end of what was a complex ending in the novel. The other element that I found getting in the way were the transferring the words written by the narrator, Nick Carraway, played by Toby Maguire. I also do not understand why we need to have Nick telling the story to anyone but the audience. The entire sanitarium sequence is useless and an unnecessary device so we can have words floating all over the screen. While I am at it, Gatsby does not need to start or end every sentence with the words "old sport." The entire point is that Gatsby is good at looking like new rich and fitting in. The constant addition of "old sport" makes it appear that he isn't.
I am not one to ever expect movies and books to be equals. Still, the movie lacked depth. It was a surface level. Like Moulin Rouge, it is visual and mostly well acted but lacks depth that it needs to become truly great film. The Great Gatsby is worth the watch, but is merely okay.