Suzi's insecurity
There's a really nice touch with the depiction of her personality. It's not really necessary to anything about the plot so I appreciate how it just makes her more of a realistic character.
She's talking to Skip on the phone, and he says he'll call her later--eliciting her immediate response "when?" A very needy and counterproductive move there, but you can totally imagine an insecure, inexperienced teenage girl saying something like that.