The two details that help develop the story into a satire are:
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Gortsby is very cynical and distrusting of the young man he meets. - This aspect highlights a critical view of human nature and society, which is often found in satirical narratives.
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Gortsby changes his view after finding a bar of soap on the ground. - This ironic twist underscores the absurdity of judging someone's truthfulness based on trivial material evidence, reinforcing the satirical elements of the story.