Continuity mistake: During the dinner scene at Tom's, a couple of shots before Tom's phone rings and he goes to answer it, Nick's wine glass is about half full. After Daisy leaves to go to Tom and the shot cuts back to Nick, the level of wine in his glass has notably decreased, without him touching it. (00:09:50)
Chosen answer: This has been answered before. Gatsby grew up in a poor, mid-western family. He is a self-made millionaire (through illegal means) but pretends he comes from wealthy, upper-class society. He has adopted a fake posh accent to help support the illusion of his bogus background. It is how he believes well-bred people speak.
raywest ★