Are there any examples of situational, dramatic, or verbal irony in the story, and if so, what function does the irony serve?

Dramatic irony is seen when Arnold Friend comes to
Connie's house.  Up until this point, she has made it clear by her secretive actions and
attitudes that she is beyond having to be worried about, and that she is adult enough to
handle herself in the world of older people, like the boys she sees at the restaurant
across the highway.  The irony, of course, is that when she is confronted with an older
guy, she is totally out of her league.  Arnold Friend is much older, though he eerily
acts much younger to "seduce" his prey.  When he shows up at Connie's house, she plays
word games with him, telling him he must leave, but he knows she is alone, and quickly
wears down her resistance.  The most frightening thing about the situation is that even
as he erodes her resistance and she realizes the danger she is in, she doesn't have a
strong enough sense of self to even resist: she quietly accepts what she knows will be
her fate.