Missing Episode: The 1926 adaptation is a famous lost film. Very little of it is known to exist.
Reality Subtext: Gatsby and Daisy's relationship is not dissimilar to that of Scott and Zelda Fitzgerald, though it has more in common with the relationship between Scott Fitzgerald and Genevra King.
Write What You Know: It's believed that Daisy was based off of Ginevra King, Fitzgerald's ex-girlfriend who was also a rich Chicago socialite. Likewise, Tom is believed to have been based off of William Mitchell, the man who Ginevra eventually married. Fitzgerald himself confirmed that Jordan was based off of Edith Cummings, one of Ginevra's friends.
The 2013 film:
Actor Allusion: Nick reaches for the last drink on a tray too late and it's snatched by someone else. That exact thing happened to Peter Parker in Spider-Man 2.
Carey Mulligan (26) as as the 23 year old Daisy and Leonardo DiCaprio (36-37 during filming) as the 32 year old Jay Gatsby, who also play those characters in flashback when they are 18 and 27, respectively.
36 year old Tobey Maguire as 29 (later 30) year old Nick Carraway.