Ryan Murphy stated that there was a scene in which Matt Bomer was that was "the most twisted thing we've ever done," calling it a "True horror scene."
In American Horror Story: Coven, Gabourey Sidibe played a character named Queenie. In Freak Show, she plays a character named Regina, the Latin word for "queen."
The musical theme played throughout Season 4 (Freak Show) is taken from the opening notes of the song "Black Sabbath" by Black Sabbath. It is played an octave or two higher and on violins, however. It is also played during the ending credit sequence of each episode.