Quote 7
I had kept my promise; I had found him (19.1).
Although he doesn't have to do this, the narrator keeps his word to Holly and finds her cat. It seems he feels that loyalty is a part of friendship, too.
Quote 8
"But Holly! It's dreadful!" "I couldn't agree more; but I thought you wanted it" (8.6-8.7).
Although Holly doesn't like the idea of the birdcage, she buys it for the narrator because she thinks it will make him happy. She is capable of self-sacrifice when it comes to the people she really cares about.
Quote 9
Her bedroom was consistent with her parlor: it perpetuated the same camping-out atmosphere; crates and suitcases, everything packed and ready to go (6.3).
Holly's apartment speaks to her lack of plans. She lives an impetuous life and it seems she's always ready to go where the wind may take her.