Oh Castle, my Castle · 5:17am
I really enjoyed this episode. This was exactly the kind of a thing -- a slice-of life that was funny, a bit silly, and had a lot of heart -- that we needed after the unexpectedly dark (but awesome! but dark!) season opening. Everyone, including Spike, had their moments to shine (or not, and there were a ton of nice little touches, like his Rarity plushie. Also, they've been doing Pinkie very right in these new episodes, if you ask me!
And, unlike some people, I'm glad they nixed the possibility of the treebrary coming back. One core element of the show has been, from the start, that you must change to grow; you don't have to leave your past behind, but you can't and shouldn't get stuck on it. Tying it into Twilight's new crystal treehouse and into her memories of all the good times in Ponyville was just about the best thing they could do.