- Acting for Two: Sarah Paulson is confirmed to be playing THREE separate characters: Billie from Murder House, Cordelia from Coven, and newcomer Venable. Taissa Farmiga is confirmed to be playing both her Murder House character of Violet Harmon and her Coven character of Zoe Benson. Evan Peters is returning as Tate Langdon and playing hairdresser Mr. Gallant, as well as Jeff and a brief appearance as James Patrick March from Hotel. Whether he returns as Kyle from Coven remains to be seen. Joan Collins appears as Evie Gallant and as Bubbles McGee. Billy Eichner appears as Brock and Mutt. Frances Conroy appears as her Coven character Myrtle Snow as well as Murder House character Moira OHara. Kathy Bates appears as Ms. Miriam Mead and cameos as her Coven character, Madame Delphine LaLaurie.
- Approval of God: Ryan Murphy wholeheartedly approves of fans comparing this season to Avengers: Infinity War, due to the large ensemble cast, being a crossover and having world-ending stakes. Became full-blown Ascended Fanon when Murphy used the caption of "AHS: Infinity War" on his instagram for a post showing off the cast.
- Dawson Casting: 31-year-old Evan Peters and 24-year-old Taissa Farmiga reprise their roles as ageless teenage ghosts of the Murder House. YMMV on how much (or if) either of them has aged since then.
- Directed by Cast Member: Sarah Paulson directed the sixth episode, "Return to Murder House."
- Enforced Method Acting: According to some who worked on "Boy Wonder", the actors' reactions to Stevie Nicks's singing are genuine.
- Fan Nickname:
- The season itself has "Coven 2."
- The woman that the Mead android is based off of is commonly referred to as "Devil Mama," as it's unclear if "Miriam Mead" is her name, too, or just the android's. (She is referred to as "Ms. Mead" by the butcher in "Traitor", so it seems that it is her real name.)
- American Horror Story: Infinity War. Even Ryan Murphy himself is in on it.
- The season now has the additional nickname of American Horror Story: Days of Future Past after the final episode.
- Putting the Band Back Together: Taken to an extreme this season.
- Separated-at-Birth Casting: AHS rookie Cody Fern could so pass off as the child of Evan Peters and Connie Britton. The makeup department's decision to give him Vivien's and Tate's hair in his present and flashback scenes respectively emphasizes the resemblance even further.
- Shout-Out: The 10/24 episode contains an extended shoutout to the Tales From the Crypt story "And All Through the House", where an escaped madman in a Santa suit stalks a woman who murdered her husband. Joan Collins, who starred in the movie's version of the tale, plays a witch actress who is filming a similar story.
- Star-Making Role: Cody Fern as Michael Langdon.
- Throw It In!: The bit where Cordelia tells Myrtle I love you before sacrificing herself wasnt scripted. Sarah Paulson improvised the line and was surprised that they left it in.
- Trolling Creator: The showmakers, well-aware of whom the fans are longing to show up this season, decided to use Fleetwood Mac's "Gold Dust Woman" in episode 2... only for this musical nod to go nowhere. Until the third episode.
- What Could Have Been: Evan Peters was initally announced to direct the final episode Apocalypse Then but for unknown reasons couldnt so regular series director Bradley Buecker stepping in.
Trivia / American Horror Story: Apocalypse