Goofs

• Revealing mistakes: At the end the film, Marrow leans heavily on a, supposedly, carved marble pillar but it flexes as easily as a piece of rubber.
• Continuity: Luke attempts to crash the gate while driving Nell's Gremlin. After he hits the gate, a large oval portion of the gate that has spikes falls down onto the top of the car. The oval portion covers the hood, and the spikes penetrate the roof of the car. The doors cannot be opened because of said spikes. In the last scene where the caretakers (Mr. and Mrs. Dudley) come back to unlock the gate, the Gremlin is still there, but the oval portion that fell is still in the gate, and there are no holes in the roof of the Gremlin.
• Continuity: When Nell and Theo first find the mirror/carousel room, they step onto the revolving floor twice.
• Continuity: When Theo and Nell are taken into their room for the first time Theo does a front flip onto her bed, but lands facing backward.
• Continuity: When Hugh Crain's spirit sends Dr. Morrow and Theo flying across the room into a wall, the wind is blowing fiercely. Theo's hair gets completely disheveled, complete with a confetti-like substance in her hair. Two to three seconds later, after the wind has stopped, her hair has no confetti in it and appears to have been brushed out.
• Continuity: When Lilly is sitting in the main room, filling out tests: in the near shot she puts a test down, picks up a new one up, and begins to fill it. In the wide shot, she picks the same test back up and begins to fill it out again.
• Continuity: When Nell is doing the puzzles Dr. Marrow gave her, the first two we see are done with a green magic marker, yet we saw her using a pencil.
• Continuity: The fountain when Dr. Marrow and Nell first visit the greenhouse.
• Anachronisms: The Blue Nursery Room, which has been closed for 130 years, has a modern telephone on the bedside table.
• Continuity: From the outside, rooms have square window frames, from the inside they are arched. The ceilings, when filmed from the inside of the house, are at least 30 ft high; seen from the outside they can't be more than 15 feet.

Taglines

• Some Houses Are Born Bad.
• Some houses are born bad
• Sleep Tight
• Welcome to Hill House. This is its body, this is its skin, this is its eyes. Won't you come in?
• Ghosts with the most.
• It will haunt you
• Inside the Haunted

Trivias

• The creaks and moans heard throughout the house were pre-recorded and played during filming in order to get a more natural expression of fear out of the actors.
• 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.
• The title of the movie was changed from "The Haunting of Hill House" (another film, House on Haunted Hill (1999) was to be released later that year).
• Liam Neeson is afraid of heights so his fear when he was dangling off the flight of steps whilst trying to save Nell, required no acting
• Writer Michael Tolkin, as script doctor, did a uncredited re-write on the script.
• The outside of Hill House, as well as some interiors were filmed in Harlaxton Manor, in England.
• The part of the big lion head in the fireplace was originally played by a large green ball.
• 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.
• Cinematographer Caleb Deschanel was originally attached to photograph the movie and even completed some of the filming, but dropped out due to creative differences.
• The project was originally with Dimension films, with Wes Craven attached to direct.