I wonder if they re-shot the ending after they knew they were cancelled
After watching the series finale, it seemed to me that it ended with lots of closure and hope for the characters. But I wonder if this was how Season 2 was originally supposed to end. I wonder if once they were told the series had ended, they re-shot the final scenes to give it closure. It wouldn't be hard for them to do, although Amanda Peet was going to have to get into that costume again for it!
Maybe this was how Season 2 was ending anyway, but again, it just seemed to have the closure of a final series episode, and how would they have known that when that episode was shot?