Another good episode.
One background character, now officially known as Bulk Biceps, appeared frequently in this episode and had many lines. Perhaps some other background characters might get this treatment in future episodes?
We also saw the return of Derpy (and the fans go nuts afterwards). Not only that, but it was for multiple scenes, even though she didn't say anything at all. Considering the controversy back in season 2, I think that was pretty much the most we could have realistically expected to see in an official episode.
I can now say a pattern has been confirmed for this season. Look at Rainbow Dash in this episode and Rarity in "Rarity Takes Manehattan" and you'll see some similarities. In Rarity's episode, she received a spool of thread from Coco Pommel; In this episode, Rainbow Dash received a Wonderbolts badge from Spitfire. Of the remaining four, I predict Pinkie Pie will be next, in two weeks. (Interestingly enough, that also happens to be the one that will feature Weird Al, so that makes two things to look forward to in that episode.)