The statuettes of the directors in the introduction of each episode were sent to the directors themselves after filming was finished.
Guillermo del Toro introducing each episode is a tribute to director Alfred Hitchcock, who introduced each episode of his anthology shows The Alfred Hitchcock Hour (1962) and Alfred Hitchcock Presents (1985) (Hitchcock died in 1980, so the latter used archive footage).
Episodes 5 and 6, Pickman's Model (2022) and Dreams in the Witch House (2022), are adaptations of short-stories written by H.P. Lovecraft, published in Weird Tales: "Pickman's Model" on October, 1927 and "Dreams in the Witch House" on July, 1933.
In Lot 36 (2022) Nick Appleton finds three rare occult books to summon demons named "Liber Primus: Daemonia", "Liber Secundus: Symvolia" and "Liber Tertius: Perilipsi". He is told by Roland about the existence of an another book named "Liber Quartus: Sacramentum". Translated from Latin it means "First Book: Demon", "Second Book: Symbol", "Third Book: Summary" and "Fourth Book: Sacrament".
The term "cabinet of curiosities" originated in the 16th century in Germany, under the name "Kunstkabinett" ("wonder cabinet") or "Kunstkammer" ("wonder room" - cabinets were originally ancient rooms, then they evolved into cupboards). They were collections and exhibits of notable objects: relics, antiquities, works of art, natural or unnatural items, etc.