After the accidental tweet, Floyd states they have no beef with other bands, except that one band from River Bottom. Teeth then adds they were a Nightmare. This is a reference to the River Bottom Nightmare band that Emmett Otter's band played against in the battle of the bands in Emmett Otter's Jugband Christmas, a one-off TV Christmas special created by Jim Henson.
Riki Lindhome plays the lead "Belieber." She previously appeared with Anders Holm, who plays JJ, in The Swedes (2015), where they played a pair of Swedish detectives. Joe Lo Truglio, who plays Clark the mo-cap maestro here, played main cast member Charles Boyle on Brooklyn Nine-Nine.