Rahul Kohli and Mike Flanagan's love of Joel Miller from "The Last of Us" inspired Sheriff Hassan's dress sense.
In Mike Flanagan's previous work "Gerald's Game", Jessie throws a book at the dog with the title "Midnight Mass", which is also the name of the book Maddie was writing in "Hush".
Mike Flanagan stated in several interviews, and posted on Twitter, that "Midnight Mass" was something he had always wanted to make. He also stated that the entire series was filmed with everyone having to follow quarantine procedures because of COVID-19. He personally thanked everyone involved in the project.
In Riley's room, some Christopher Pike books can be seen on a shelf. Mike Flanagan's next project is based on a Christopher Pike novel titled 'The Midnight Club'.
Crockett Island is modeled on remote Tangier Island in Chesapeake Bay, which also has an abandoned neighbor called the Uppands (here called the "Uppards.) Crockett is one of the most prominent family names on Tangier.