Kate Walsh was originally cast in this film, but was forced to drop out due to scheduling conflicts with the television show "Grey's Anatomy" (2005). She was replaced by Mary McCormack.
The story this film was based on was almost never written. Stephen King originally created the first few pages of '1408' for his nonfiction book, "On Writing," as an example of how to revise a first draft. The story, however, intrigued him, and he wound up not only finishing a complete draft, but adapting it for an audio-book compilation of short stories.
There are many references to the number "13" throughout the movie. The room is numbered "1408", add each number together equals 13. The room is on the 14th floor, and the Hotel skips the 13th floor, so the room is technically on the 13th floor. The room's key lock also has "6214" etched into it, which adds up to 13. And the first death was in the year 1912, which adds to 13.
One of the first victims of the room was named "Grady." Grady was a character in "The Shining," Stephen King's other horror story about a hotel.
In addition to the previous numbers adding up to 13, the hotel is mentioned to be at 2254 Lexington Street in New York City. 2254 adds up to 13.
At one point in the movie Mike wears a hat that says "Paranoia is total awareness". This is a nod to one of Stephen King's favorite quotes, "Perfect paranoia is perfect awareness".
The axe the fireman uses to break down the hotel door at the end of the movie is the same axe that Jack Nicholson used in The Shining (1980) (both movies were also shot at the same studio -- Elstree, in London)
Towards the beginning of his stay in room 1408, Mike mentions that "some smart-ass" once wrote about the 'banality of evil.' The smart-ass in question is German political theorist and intellectual Hannah Arendt, who wrote about the 'banality of evil' in her essay "Eichmann in Jerusalem."
While addressing his audience at the book signing, Mike says, "Stay scared." This is a phrase traditionally used by director George A. Romero, a friend of Stephen King's. Romero has said this at numerous conventions and often uses it as part of his signature.
Mike Enslin has a Chicago White Sox hat. Chicago is John Cusack's home town. Also, in a previous film, Eight Men Out (1988), Cusack portrayed White Sox third-baseman George "Buck" Weaver. Cusack himself is a both a devoted Chicago Cubs and Chicago White Sox fan. He has said so in numerous interviews.
The initial story inspiration for 1408 came from a collection of real-life news stories about parapsychologist Christopher Chacon's investigation of a notoriously haunted room at the famous Hotel Del Coronado in Coronado, CA, as well as another undisclosed hotel on the East Coast.