things friendship is witchcraft featured before they ever became even remotely a thing in the actual show:

-twilight having a brother
-twilight becoming a princess
-gypsy!pinkie (that one scene in “it’s about time”)
-the EQG mane six forming a rock band (i completely forgot/missed this one and just found it on tvtropes jesus)
-the fucking upcoming return of the smooze in season 5