Robert Zemeckis consciously shot What Lies Beneath (2000) in the style of Hitchcock, if he had access to digital technology. Also, the heroine of the film is a blonde, which was a common trademark of Alfred Hitchcock's.
The house depicted in the film was used for day scenes only. It was torn down after filming because it didn't meet local building codes. The rooms were duplicated on an L.A. sound stage for night scenes.
According to the original script by Clarke Gregg, the scene with the Ouija board was started by Jody. Later she runs out screaming after the séance gets a little out of hand. The scene was changed for the movie in order to emphasize how much Claire thinks she is losing her mind.
Michelle Pfeiffer stated in interviews that she was initially put off by all the technical aspects of the film, but eventually learned to embrace them. In the end the actress found the experience both educational and enjoyable.
The Crown Point Bridge appears throughout the film. It was located in Addison, Vermont, near D.A.R. State Park, very close to where the house was built. It connected Crown Point, NY to Chimney Point, VT. Filming closed the bridge for several days, causing problems for locals on both sides of Lake Champlain. The bridge closed permanently on October 16, 2009, after an inspection revealed serious deterioration. It was demolished December 28, 2009. Its replacement, the Lake Champlain Bridge, opened in the same spot on November 7, 2011.
At 9.40. Into the movie Claire is folding some clothes into her daughters bureau. One of the things that is put on the bureau is a small E.T. doll. Harrison Ford was once married to Melissa Mathison who was the screenwriter of E.T.
When Michelle Pfeiffer lies stunned on the floor and the murderer leans over her face, the camera seemingly cranes down underneath the floor to look directly up at her face. The effect was created by using a glass floor. The solid floor at the start of the shot is drawn in by computer. A glass floor is also used when she drops the keys later on.
Throughout the film, Claire's eyes are blue. When Claire allows Madison to posses her body, her eyes become green. Director Robert Zemeckis asked Michelle Pfeiffer to wear contacts in order to emphasize the eye color change from blue to green to identify a "change of character".
When Claire visits the village of Adamant, she realizes Madison's necklace and the key she's found came from a store called "The Sleeping Dog". This is a reference to the phrase "let sleeping dogs lie" which is about not scratching the surface too much.