In the prologue of this Stephen King adaptation, Thad Beaumont (Timothy Hutton) wants to become a writer, and is shown writing stories. The title of his first typewritten story is "Here There Be Tygers", which is also the real title of the first short story King wrote in his career. The story can be found in King's "Skeleton Crew" anthology.
The original novel mentions a character, who's never seen, by the name of Wilma, whose catchphrase is "Just call me Billy". This is a reference to the character of Wilma in "The Crate", a short story by Stephen King, that was adapted by King as a segment of Creepshow (1982), also directed by George A. Romero.
In total, four thousand five hundred Cut Throat Finches were used for the sparrows in the film. The birds would consume one hundred pounds of birdseed, and fifteen gallons of water on a daily basis during the production.
Movie tie-in adventure game, also called The Dark Half, was released for MS-DOS in 1992. It loosely follows the plot of the movie, and resembles Lucas Arts and Sierra's early adventure games. The game immediately fell into obscurity, and is now a collector's item among King's and adventure games fans.
Different artwork was created for the Australian print ads. The image featured an illustration of Thad Beaumont. One half of his face was that of Timothy Hutton, while the other half was a heavily-stylized version of evil alter ego George Stark. A shiny straight razor was in the center, splitting the image.