SERIES FINALE: The last batch of episodes for the final season of The Unbreakable Kimmy Schmidt shows up today, wrapping up the series on an optimistic note – and on lots of notes, period, as music takes a playfully prominent role in many of these final stories. Watch them in order, but pay attention, in particular, to the “Sliding Van Doors” episode, in which Kimmy’s reality follows an alternate, and very, very different time line, allowing all the regular players (Carol Kane especially) to play with wildly unusual variations on their characters. And, of course, the finale itself, which embraces its inner giddy and goes out with hugs and smiles all around – a complete shift from the way it began.