At one point, Verna says, "As I said to one of my clients, you could stand in the middle of Fifth Avenue and shoot somebody and it wouldn't cost you a thing.". This is a near-direct quote of former President Donald Trump during a campaign speech in January 2016.
Zach Gilford's spouse and actress Kiele Sanchez co-wrote the eighth and final episode with Flanagan.
Bruce Greenwood, Carl Lumbly, Robert Longstreet, Henry Thomas, and Kyliegh Curran all starred in Mike Flanagan's Doctor Sleep (2019).