Evan Peters plays Jimmy Darling in AHS: Freakshow. His character is based on the real life "Lobster Boy," Grady Stiles Jr..
Frances Conroy (Gloria Mott) and Kathy Bates (Ethel Darling) worked together previously on Six Feet Under (2001), Conroy as part of the main cast, and Bates as director and later guest cast.
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.