Episode review: S6E15: "28 Pranks Later"

Was there a Cookie Monster joke in this ep? If not, why not?

In the last two weeks, we've had an episode I loved and an episode I... didn't love. This time around we had a brand new writer to My Little Pony in the shape of F. M. De Marco. They had previously worked on Littlest Pet Shop, however. With zombies having been canon since Pinkie mentioned them way back in "Bridle Gossip", I was rather hoping that we'd get a fun yet just slightly scary episode. What we actually got was...