Dani is staying in room 217 before taking the job at Bly Manor. This is the same room number as the most dangerous room in Stephen King's book The Shining. Creator Mike Flanagan has directed two King adaptions including Doctor Sleep (2019) and Gerald's Game (2017).
Oliver Jackson-Cohen was originally cast as Jaime, the gardener, but he thought it would be too jarring to viewers of The Haunting of Hill House (2018) to see him as Victoria Pedretti's lover having previously played her twin brother.
Greg Sestero from the cult classic film "The Room" plays the Fiancé in the opening scenes.
Although set in England, most of the series was shot in Canada.