"Mash-Up" was written by series creator Ian Brennan and directed by Elodie Keene.
The episode features covers of "Bust a Move" by Young MC, Sisqó's "Thong Song", Neil Diamond's "Sweet Caroline", "I Could Have Danced All Night" from the musical My Fair Lady,[REF] and "What a Girl Wants" by Christina Aguilera [REF].