The names of some of the characters carry a tribute to the original Danish series, _"Riget" (1994) (mini)_. Hook was in Danish Krogshøj (krog meaning hook), Mrs Druse was originally Drusse, the character Carrie Von Trier shares surname with author of the original series, Lars von Trier, and Otto's name in the Danish series was Hansen where he was played by Danish actor, Otto Brandenburg.
The scene where Peter Rickman is hit by a car happens almost exactly how Stephen King described the time he was hit by a car in his memoir, "On Writing". The only difference is that the man who hit King in real life was older, sober and stopped to see if he was all right.
Unhappy with the lack of network advertising, Stephen King paid several hundred thousand dollars for full page color print ads in major US newspapers advertising the show. The very next week ABC changed the shows time slot to go against CSI.
In episode 12, one character is making a potion using a recipe from a book called "Love potions, charms and spells", written by Barlow and Straker. Those are the names of villains from Stephen King's "Salem's Lot".
In the episode "Shoulda' Stood In Bed", the name of the lawyer that found Mona Klingerman's anesthesiology report is Stephen Dooling. Stephen Dooling is made up of parts of the names of the producers of Kingdom Hospital, Stephen King and Richard Dooling.
The exteriors of Kingdom Hospital is actually the Workers Compensation Board building in Richmond, British Columbia, and isn't actually a hospital. However, just across the road from the WCB building is the Richmond Hospital, a real hospital. (The location of both buildings: intersection of Wesminster Highway & Gilbert Road.)
Blondi (Otto's German Shepherd) was named in reference to infamous Nazi leader Adolph Hitler's own German Shepherd. Coincidentally, "Otto" was the name of Hitler's own administrative assistant (Otto Günsche) however in Kingdom Hospital, Otto was actually named after Danish actor Otto Brandenberg (of the TV miniseries Riget, who played the similar character Hansen).