Oh dear, lots of pages to catch up on, but I'm glad I didn't spoiler myself
Sooo, here's my first time impressions of the episode, before having read any of the other posts:
-Dat opening. Man, was that cute, and set up the atmosphere perfectly. Dat tree hat. Also, snowpony. Man, I wish we could have seen Lyra build the snowman from that one comic ^^.
-Holy ****, best episode of all time ever. "Pegasusisusiis" rofl. Crown on the wrong way, awesome. Frost giant ponies.
-WORLDBUILDING BACKSTORY AWESOMENESS
-OK! Either the Mane 6 are absolutely amazing actors/method actory, or they let them improvise like crazy. Both also very likely! Man, Pinkie... holy crap, I'm not coherent.
OK, I'll make this brief, my favorite episode ever. I don't really care what this says about my love for the Mane 6 when my favorite ep isn't really about them per se, but I don't care. Holy crap, loved everything.
"It's time to bring the PAINBOW!"
-Rainbow Dash, Friendship is Witchcraft