The 1974 version is one of my favorite movies. I need to see if it’s on Netflix.
Many of the extras were Navy people from the Naval War College and the air base in North Kingstown, as well as ships in port. My parents always enjoyed spotting their friends in the crowd scenes!
(And ... it’s on Netflix streaming. There’s also a 2000 version with Mira Sorvino as Daisy, which comments on Netflix say was a Fail.)
I love the 1974 version. I was never a big Redford fan but thought he made a great Gatsby and I was always a big Bruce Dern fan but thought he was miscast as Tom Buchanan.