The Pegasus weather manager and the unicorn troop leader were both unnamed, but the credits reveal their names as Feather Flatterfly and Fire Flare.
This marks the second time since "The Mean Six" where the Mane Six were unaware their enemies were in the same location as they are.
Chrysalis uses her pony disguise from "The Mean 6". Her form also gets a name, Crackle Cosette.
Throughout the episode, the ponies and princesses had no idea the villains were present and all the disasters were their fault.
The book on the Bewitching Bell is found in the Star Swirl the Bearded wing of the Canterlot Archives, where Twilight looked to find a spell to stop time in "It's About Time".