Derpy and Doctor Hooves (the ones from Pinkie's world, not the time traveling ones) leave the story after emptying Star Dancer's fridge.
Two interesting things about them: in this continuity they seem to be a couple, or at least very close friends (thus ignoring the series' finale) and when this Doctor found the other Doctor's Tardis, it recognized him as not it's Doctor and refused to open it's doors for him.