Hibbing 911 was one of my favorites of the season.
I've watched some of the behind the scenes stuff, and it really does seem like a good time. I think it's interesting that in interviews Padelecki seems to take the lead more than Ackles, and on the show, it's the reverse with their characters (Dean leads more than Sam, I think).
I would like more Misha Collins this season, but badass Cas, not wimpy Cas!