Finally saw the episode - it took 7 hours to download over my borked connection. Talk about worth the wait!
There is absolutely no such thing as too much Rarity. Every time that pony opens her mouth, I always end up either cackling hysterically, d'awwing, or just plain gasping with shock at some awesome moment.
I found the OMG PARENTS appearance to be particularly intriguing, given that previous episodes had Sweetie Belle showing up at Rarity's with no comment, to the point where some people could even have assumed that she already lived there.
Just how long can Season 2 maintain this trend of absurdly high quality for?