"Rich girls don't marry poor boys, Jay Gatsby. Haven't you heard?"
Daisy says this to Jay when he wants to know why she didn't wait for him like she said she would during the war. While he has attributed it to her inconstancy, Daisy sums it up more ruthlessly and straightforwardly with this assessment. She insists that their union was impossible at the time, because he was poor, and thus beneath her class position.
"Only one?"
This is Gatsby's response to Nick saying that he's heard Gatsby killed a man. Gatsby's response is charming and disarming in its sarcasm. This line shows that Gatsby is both very socially able, but also insistent on remaining serious. In evading the question, Gatsby suggests that the rumor Nick heard is absurd, but he also doesn't explicitly refute it.
"What'll we do with ourselves all afternoon, and the day after that, and the next thirty years?"
Daisy yells this at Tom as they are having lunch with Gatsby, Nick, and Jordan. She is asking how they will go on and on in their marriage even though they don't love each other. She is frustrated with all of the secrets and lies in her marriage and lets some of that frustration out in this line, snapping at Tom.
"And when I was in the delivery room, waking up from the ether, I asked the nurse whether it was a boy or a girl. She said it was a girl—and I turned my head to the side and cried. And then I said, I hope she grows up to be a pretty little fool. That's about the best a girl can hope for these days, to be a pretty little fool."
This tragic line of Daisy's outlines how unhappy she is in her life, how she feels like she's been duped by men, and that, as a woman, it's better to be unaware of the difficulty of life. She tells the story of her daughter's birth and frames it in a cynical way, suggesting that her daughter can only hope, at most, to be a fool, because then she won't realize how unforgiving the world is for a girl. This line reveals the fact that underneath her blithe and charming comportment, Daisy is hopeless and rather pessimistic.
"I was raised in America but educated in Oxford. That's a family tradition."
When Nick is getting to know Gatsby, Gatsby says this about himself. It is a straightforwardly upper-class thing to say, and Gatsby invokes his family's traditions as a way of suggesting to Nick that he comes from "old money." The explicitness of his proclamation, however, flags for Nick that there might be something disingenuous about Gatsby, that perhaps he isn't telling the whole truth.
"Summer's almost over. It's sad, isn't it? Makes you want to—I don't know—reach out and hold it back."
In some ways, this straightforward line is just Gatsby telling Nick that he is sad about the end of summer. On a deeper level, it shows Gatsby's dogged determination to try to control events and the world around him. The end of summer represents not only a seasonal change, but also the change in his life and in his relationship to Daisy. Even if he doesn't quite know it, Gatsby is mourning the loss of his summer affair, and worrying that things have changed since his argument with Tom and the death of Myrtle.
"They're a rotten crowd. You're worth the whole damn bunch put together."
These are Nick's final words to Gatsby. He insists to his new friend that he is better than the snobby upper-class people with whom he wishes to belong. Even though Daisy is his cousin and Tom his old college friend, Nick admires and respects his new mysterious acquaintance far more, because he sees that Gatsby has integrity and a grounded sense of right and wrong, in contrast to the carelessness of the richer set.
"I thought of Gatsby's wonder when he first picked out the green light at the end of Daisy's dock. He had come a long way to this lawn, and his dream must have seemed so close that he could hardly fail to grasp it... He did not know that it was already behind him."
This is the final line of the film. After Gatsby has died and Daisy and Tom have moved, Nick evaluates the whole narrative, and realizes that Gatsby's dream, and his boundless ambition, were doomed from the start, in that Gatsby was pursuing an impossible and shallow goal. It sums up Nick's distaste for the wealthy Long Island set, and acts as a kind of melancholic eulogy for Gatsby.
"I've never seen such beautiful shirts before."
Daisy says this while crying into one of Gatsby's beautiful shirts after he has thrown them into the air. She admires how fine his shirts are, weeping at the fact that her old lover who was once too poor to marry her has amassed such a massive amount of wealth. She experiences a wide range of emotions, from delight to tragic resignation, a sense that their love is impossible, or too good to be true.
"Klipspringer has been here since a party I threw in April. I didn't even realize he was here until two weeks ago."
Gatsby says this about a man who has just taken up residence in his home without asking. As he gives Nick and Daisy a tour, they run into Klipspringer, who is wearing a robe and squatting in the mansion. Gatsby's cavalier attitude towards the loafer, and the fact that he cohabitated with him for two weeks without knowing, points to his giant accumulation of wealth.
