Ellen and June! Yes! I really wish we got to see that - Ellen mentions in canon that she spoke to June, but I would so loved to have seen that onscreen.

I imagine they'd each be a little wary of the other at first - they are coming from opposite sides of the law, even if they are both retired, but I imagine they'd have a lot to talk about beyond just Neal.

Another scene I love to imagine, even though there's not really any room for it even in fic without going majorly AU, is a conversation between June and Kate. About what it's like to maintain a long-term relationship with someone who's in prison, and the sacrifices and constraints they had to accept in structuring their lives and those relationships around letters and the routine of weekly visits, and how they both made it work. And the frustrations they didn't always share with Neal and Byron, and the times they were tempted to leave, and the reasons why they didn't.