One of the few episodes that I would call "perfect" -- it's like a little self-contained movie.
Even people who don't know anything about the story or characters could watch this and follow along with the mood and feelings and enjoy it, and of course the awesome animation and pacing would impress them too.
I like how this episode has a lot of quiet moments in it: not a lot of talking, not a lot of BGMusic (though the music they use is good) -- it makes you stop and think about life, in a good way. I think the same animation crew that did 85 did this one too. They're the best!