“With an effort I managed to restrain my incredulous laughter.” p.64
However, Nick’s impression is challenged when Gatsby shows him a medal he received in the war.
“To my astonishment, the thing had an authentic look” p.65
Gatsby then shows Nick a picture of himself at Oxford and Nick says,
“Then it was all true.” p. 64
Nick now appears to believe in Gatsby's version of his background. How does that affect our understanding of the protagonist?