Liam Neeson nicknamed Catherine Zeta-Jones "The Welsh Gazelle", because they repeated a running take time after time, and he couldn't keep up with her.
Stephen King wrote the first draft of the script. When this fell through, he re-worked it into Rose Red.
This second adaptation of the book was going to be titled "The Haunting of Hill House", which was the original novel title. It was shortened back to "The Haunting" to avoid confusion with House on Haunted Hill (1999).
The house used in the film is located in Grantham, England, and is owned by the University of Evansville (Indiana). It is used by students that study abroad.
Liam Neeson is afraid of heights, so his fear, when he was dangling off the flight of steps while trying to save Nell, required no acting.
This isn't a remake of Robert Wise's classic, as the production company did not have the remake rights. They were not allowed to replicate even one shot from the 1963 film. Instead, it is a new adaptation of Shirley Jackson's novel.
The creaks and moans heard throughout the house were recorded and played during filming in order to get a more natural expression of fear out of the actors.
The tagline for this movie "some houses are born bad" is also a line that Dr. Joyce Reardon says in the Stephen King made-for-television series Rose Red (2002).
The outside of Hill House, as well as some interiors were filmed in Harlaxton Manor, in England.
At the time of its release, it was widely rumored that Steven Spielberg either directed some scenes or participated in post-production because he didn't like the rough cut he saw. This was, however, never confirmed.
Several of the sets depicting Hill House were built in the hangar that housed The Spruce Goose, the mammoth airplane built by Howard Hughes.
An alternate ending was also filmed, in this version, Dr. Marrow (Liam Neeson) writes a book regarding the results of his fear study and is dedicated to Luke (Owen Wilson), Nell (Lili Taylor), Rene Crain (Kadina de Elejalde), and Carolyn Crain (Hadley Eure). He even mumbles that they are immortal. Theo (Catherine Zeta-Jones) pays a visit to the peaceful Hill House, seeking both Nell and happiness.
The project was originally with Dimension films, with Wes Craven attached to direct.
Cinematographer Caleb Deschanel was originally attached to shoot the movie, and even completed some of the filming, but dropped out due to creative differences.
This was the first film for uncredited Executive Producer Samuel Z. Arkoff in almost fifteen years. It also gave him a chance to work with his daughter, Donna Roth, who was one of the producers.
The film cast includes one Oscar winner: Catherine Zeta-Jones; and five Oscar nominees: Liam Neeson, Owen Wilson, Virginia Madsen, Todd Field, and Bruce Dern.
The set designed by Eugenio Zanetti and built in the Spruce Goose hanger was one of the largest interior sets ever built.
The part of the big lion head in the fireplace was originally played by a large green ball.
In this movie, Owen Wilson plays a character named Luke, his brother's name in real-life.
The official Spanish title for the film is "The Haunting (La Guarida)". Translated to English, it would be "The Haunting (The Lair)".
Even though he's uncredited as executive producer Steven Spielberg casted Catherine Zeta Jones (Theo) five years later, in The Terminal (2004).