The first version of "That's What I Love About Christmas" at the beginning of the movie is the only song in the movie with no singer attributed to it in the credits.
Look Carefully: When Sunny Daze and Minty are discussing socks, their eye highlights are red instead of white.
When Minty says "It's Christmas, time to go home. Can you lead us the way back to Ponyville?", her mouth briefly moves out of alignment with the rest of her face.