I am absolutely obsessed with this bit because it feels like an intentional way of giving the audience a glimpse into Nick and Charlie's future as a married couple. It's just the two of them saying goodbye to their friends, but you get the sense that this house is theirs — it's their home; they just hosted a party, and now they're going to bed. They're teenagers but already so established and so comfortable in being together that they look like they've been married for 10 years. It's so beautiful and, in a way, quite subtle, but I'm in love with it.