A pony who looks suspiciously like an adult Babs Seed can be seen.
An old mare is crossing the street when a carriage screeches to a stop in front of her, to which she replies "Hey, I'm trottin' here!" This is a reference to the movie line "I'm walkin' here!" from Midnight Cowboy.
When Rarity is offering friendship advice a pony with a football cutie mark and a Charlie Brown shirt - except green - passes by. And as he passes you can hear the Peanuts theme play for a coupe measures.