Where are some examples of repetition located in The Great Gatsby?

In The Great Gatsby, Jay Gatsby
repeats the phrase "old sport" 42 times:

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"Want to go with me, old
sport?"

"I thought you knew, old
sport."

"If you want anything, just ask for it, old
sport."

The phrase is a
paradox.  It is a kind of boyish term of endearment and what an old-timer might call one
of his cronies.  As such, it combines both the "old" and new (sports), which sums up
Gatsby's character: a mix of old (poor military man) and new (playboy mystery
man).

Sports were becoming the hallmark of American life in
the 1920s: we were becoming a nation that loved games.  Tom plays polo and football.
 Jordan plays golf.  Meyer Wolfsheim fixed the 1919 World Series.  Sports was a new form
of entertainment with an old criminal underbelly.

Nick also
repeats the phrase "and so" over 20 times in the novel.  His narrative voice in both
inside and outside the story.  "And so" has a detached ring to it, as if Nick doesn't
want to advance the plot to its tragic
end:

And
so with the sunshine and the great bursts of leaves growing on
the
trees--just as things grow in fast movies--I had that
familiar
conviction that life was beginning over again with the
summer.

There was so much to read for one thing and
so much fine health to be
pulled down out of the young
breath-giving air.

Other phrases too
are repeated for effect.  A number of characters (Daisy, Jordan, Owl Eyes, Gatsby) all
say "Absolutely" to exaggerate and punctuate their feelings.  It's one of those trendy
words that Fitzgerald uses as part of the Jazz Age style of the
novel.