Zava pays off imo. It’s subtle but it’s there.
Keeley growing from party girl to successful business woman is an arc started in S1. It’d be weird if they just dropped it now.
The psychic does pay off too, but I think they could’ve found a better way to do that.
Shandy… was pretty bad and amounted to nothing. Maybe it was meant to show the path Keeley didn’t take, but again, could’ve been done better.
There’s a couple scenes where they’re hanging out outside of work too. They were definitely friends beyond co workers.