In the story, Nick interjects many observation about life and people in his narration, i need 3 more example thats not from chapter 3 and 7.The...

In Chapter 1, Nick offers commentary after Daisy laughs
that she is sophisticated:

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I waited, and sure enough in a moment she looked
at me with an absolute smirk on her lovely face as if she ad asserted her membership in
rather distinguished secret sciety to which she and Tom
belonged.

This rather subtle
observation about the tie between Daisy and Tom that exists despite Tom's philandering
becomes quite important at the end of the novel, when the two of them conspire over a
plate of cold chicken.  At the end of the novel the two come together to deal with the
unfortunate events of the day--Daisy running over Myrtle.  This secret society to which
only Daisy and Tom belong is protected by the wealth that they enjoy, allowing no one
else to enter.  Even though Daisy and Tom might have relationships with others, these
others are excluded from the secret society, a society that keeps them "silver, safe and
proud above the hot struggles of the poor."  (Ch. 8).

In
Chapter 5, after Nick witnesses the reunion of Gatsby and Daisy at his house, Nick
comments that the fantasy of Daisy exceeded her reality for
Gatsby:

There
must have been moments even that afternoon when Daisy tumbled short of his dreams--not
through her own fault but because of the colossal vitality of his
illusion.

Here Nick
understands that Gatsby has made Daisy into something much bigger in his mind that she
is reality.  Gatsby's dreams are constantly undermined by the world's reality.  Daisy in
the flesh can never equal Gatsby's vision of her.  This observation of others and of
life is a keen one.  Gatsby is a romantic.  He sees others as they should be and not how
they are.

Lastly, when Nick is riding through Central Park
with Jordan and is asked to help set up a clandestine meeting between Daisy and Gatsby,
he remembers as statement that applies to the people he
knows

"There
are only the pursued, the pursuing, the busy, and the
tired."

This quote appearing
at the end of Chapter 4 is an interesting commentary on the people that Nick knows.  It
is interesting to speculate which characters in the novel fall into each of these
cagtegories.