Robin's pose in the Pee Pee Dance when they say "Let me in before I pop" mimics the pose Pinkie Pie does when she stands outside the outhouse waiting for Applejack.
Applejack and her friends work on/with a cherry-sorting machine that speeds up to the point where they can't sort all the cherries, which is an homage to the famous "Chocolate Sorting" scene from this episode.