When watching the film, personally I payed attention to the typage used by the directors. There was a clear view of which characters were selected to meet a character's goal either because of their physical appearance or their personality.
For example, Nick lean body gave signs of his weakness. Myrtle's outfit defines perfectly who she was. Since the first time we saw her when Tom visited her, we all knew what was going to happen. Similarly, Gatsby's and Buchanan worker's all faced the same case, the same as the Golden City coal workers. Moreover, Daisy's blond hair and beauty conveys the idea of who she is.
On the other side, Daisy, even though her outfit somewhat conveyed somewhat who she was, her materialistic personality shown when started crying as Gatsby threw her clothes (symbolizing money), proofs the reason why she was chosen to represent that specific character. Moreover, Gatsby's nonstop ambitious personality to get more wealth works perfectly to shown the misunderstood American Dream.
When reflecting on the book, I find certain connection in myself to Nick's personality. Sometimes my honesty and good guy attitude make me innocent and unaware of how others in society live. This motivates me to be aware of what situations others undergo to avoid joining them and what happened to Nick. I would say, both, book and movie are great pieces of timeless universal art that tell the story of a society in a certain place and time, making us more knowledgeable and teaching us life-lessons that might apply and benefit our lives in the near future.