▪ The episode's title is a reference to the 1982 film, The Last Unicorn.
▪ The symbols on the unicorn's side are a reference to the "cutie marks" in My Little Pony. (they look a lot like Rarity`s )
▪ "Celestabellebethabelle's name is a reference to Princess Celestia.(and her mane looks a lot like Celesita`s)

I wish I could show you a picture but my computer probably would explode if I did so.