Warden Norton's death from The Shawshank Redemption (1994) is mentioned, with a guard saying that "you can still see the bullet hole."
The younger version of Ruth Deaver is played by Schuyler Fisk (Sissy Spacek's daughter in real life).
Warden Lacy is listening to "Canzonetta sull'aria" from Wolfgang Amadeus Mozart's "Marriage of Figaro". This is the same piece of music that Andy Dufresne plays over the prison P.A. system in defiance of the warden and guards in The Shawshank Redemption (1994).
When Henry and Alan are discussing that the bodies were moved to "a yard up in Bangor, by the airport ' this is a reference to the novella The Langoliers.
Set in two different times, 1991 and 2018. The gap between the two is 27 years. A possible reference to IT by Stephen King.