Princess Celestia and Princess Luna appeared prominently in the episode despite neither princesses said a single word.
When Spike looks at his statue, he says, "Hello, gorgeous" like Barbra Streisand in the movie Funny Girl (1968).
This is the conclusion of the "Equestria Games" storyline which started in "Games Ponies Play" and continued in "Flight to the Finish" and "Rainbow Falls".
Two then-unknown Equestria royalty in the box seats are revealed to be the duke and duchess of Maretonia in "Twilight's Kingdom - Part 1".
Friendship Report: Spike learned to let go of the past and keep moving forward.