Stephen King said in an interview that he had Brendan Gleeson in mind when writing the character of Bill Hodges.
(23:17) Stephen King makes a cameo in Season 1 Episode 6, as a dying man with a knife through his neck in Brady's gruesome visions in the restaurant.
Brady can be heard listening to the song "Pet Sematary" by The Ramones while driving in his car. This is a song that was written for the Stephen King story of the same name.
Before his sudden and tragic death, Anton Yelchin had been tapped to play the Brady Hartsfield role.
The dance Harry performs in episode 7 is homage to Thom Yorke and Ian Curtis, Harry also played in the biopic Control which was all about Ian Curtis.