"Connie had long blonde hair (dark) that drew anyone's eye to it, and she wore part of it pulled up on her head and puffed out and the rest of it she let fall down on her back"
"He had shaggy black hair that looked crazy as a wig and he was grinning at her."
In this scene Connie's features are revealed and so is Arnold friend's . The narrator is helping us picture them and what they look like by using these descriptive adjectives. The point of describing their physical features is to show how they wanted or felt the need to be attractive.
"She had a high, breathless, amused voice that made everything she said sound a little forced, whether it was sincere or not."
"It was boy with shaggy black hair, in a convertible jalopy painted gold."