The episodes tiltle is a reference to the historical family feud "The Hatfields and the McCoys"
Friendship Report: Twilight and Fluttershy taught the Hooffields and McColts that being friends with each other is much more important than winning a single argument.
Twilight uses her freeze spell for the second time since "Castle Mane-ia".
The members of the Hooffields are various shades of red and brown, while the McColts are blue, turquoise and navy.