The series is set in 1992 and 2018, with Henry Thomas playing the 1992 version of Hugh Crain, and Timothy Hutton playing the 2018 version. Although Hugh is supposed to have aged 26 years, Hutton is only 11 years older than Thomas. In addition, Luke and Nellie are supposed to be 32, but Victoria Pedretti (Nellie) was only 22 during filming, and is 9 years younger than her "twin", Oliver Jackson-Cohen (Luke).
Throughout the series, the cook-stove/range in Hill House is an electric model from 1940s or 50s, clearly (and wrongly) shown with an exhaust duct extending from behind it and into the wall. Electric ovens don't need exhaust ducts - gas ovens do, to vent the byproducts of combustion. The model in the episode isn't dual fuel. There's no need for this duct at all.
The DVD and Blu-ray releases feature extended and/or previously unseen scenes for episodes 1 (The Haunting of Hill House: Steven Sees a Ghost (2018)), 5 (The Haunting of Hill House: The Bent-Neck Lady (2018)), and 10 (The Haunting of Hill House: Silence Lay Steadily (2018)).
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We asked Doctors Jo Wilson, April Kepner, and Andrew DeLuca to tell us the episodes of the show that they think are the most essential to understanding their characters.