One of the stained glass windows in the Canterlot Castle shows Flurry Heart in her adulthood.
This is the final episode/movie of My Little Pony: Friendship Is Magic.
Pinkie Pie seems to be the only one out of the Mane 6 to have a kid of her own.
The cover of the Power Ponies comic book that Twilight Sparkle finds and gives to Spike is a parody of the cover of Action Comics #1 in which Superman premiered.
Pinkie Pie and Cheese Sandwich give birth to a child named Lil' Cheese; while Lil' Cheese has the distinctive general appearance and structure of a filly, the script claimed Lil' Cheese's gender to be male. However, the child was not referred to with gender-related pronouns, making them ambiguous.