Earlier today, a tweet by Andrea Libman alerted us to a top-10 list on a website called "Kidzworld" written by Hasbro Vice President of Development Mike Vogel and Executive Director Brian Lenard.
In it, we get confirmation of many of the references that have been speculated about for years, and a couple more.
Among the list of easter eggs, we get confirmation once and for all, which character Future Twilight was referencing. According to the writers, her outfit is a reference to Snake Pliskenn from "Escape from New York" (and not any of his parodies or Solid Snake).
Other references are less-obvious
#1 brings hope that Derpy's name will return to canon, and no longer leave her as "Muffin Symbol".