Ryan Reynolds chose not to become close with his "movie" children. He was not mean or rude to them, just very distant. So distant in fact that the children often confided to those on the set that "Ryan doesn't like us!" Ryan said that he did not want to "fall in love" with the kids. Ryan did this so that when George Lutz started changing, he would have no trouble easing in to the verbal and physical abuse.
For the closet scene with the babysitter, the production crew had originally ordered in a rubber door. After shooting the scene a few times, they decided it didn't look right, and they ultimately decided on using a real wooden door, so actress Rachel Nichols had to bang her hands on the door for two days straight while filming the scene.
Except for the attic windows and the vaguely Dutch Colonial style, the reproduction of the house does not resemble the actual house in Amityville as it was at the time the events were said to have taken place. Also, because of huge tourist interest in the house, the original house has been altered and is now less recognizable.
(at around 33 mins) In the original script, the poster on Billy's bedroom wall during the babysitter scene was of a different band. However, when the crew realized how long of a tongue actress Rachel Nichols (who played the babysitter) had, they decided to change it to a poster of the rock band KISS, because of band member Gene Simmons' very long tongue.
On the Bio program Celebrity Ghost Stories (2008), Melissa George confirmed the supernatural feelings she had on the set when the cameras were not rolling. Also during production, she along with the rest of the cast and crew learned that the real Kathy Lutz, whose story inspired the movie, had sadly passed away before shooting was finished.
MGM claimed the remake was based on new information uncovered during research of the original events, but George Lutz later claimed nobody ever spoke to him or his family about the project. When he initially heard it was underway, his attorney contacted the studio to find out what they had in the planning stages and to express Lutz's belief they didn't have the right to proceed without his input. Three letters were sent and none was acknowledged. In June 2004, the studio filed a motion for declaratory relief in federal court, insisting they had the right to do a remake, and Lutz countersued, citing violations of the original contract that had continued through the years following the release of the first film. The case remained unresolved when Lutz died in May 2006.
This was the last picture Metro-Goldwyn-Mayer (MGM) released as an independent company. On April 8, 2005, the studio was acquired by several companies, including Sony, in the middle of the promotion for this movie. Several other films, including Into the Blue (2005) and The Pink Panther (2006), were already produced and set for release by MGM at the time of the buyout, and were later released by Sony Pictures.
While the reproduction of the Amityville House's famous exterior was constructed in Silver Lake, Wisconsin, many of the interiors were built on a temporary sound stage in an empty building located in a corporate park in Buffalo Grove, Illinois. The production company took out building permits in the village of Silver Lake, Wisconsin (in Kenosha County) and spent about $60,000 to adapt the historic Rustman House summer estate on the south shore of Silver Lake at Kenosha County Highways F and SA for its cinematic debut. (The Rustman fortune was earned in the Jefferson Ice company of Chicago in the harvesting and storage of ice from the wintertime lakes of Kenosha County and elsewhere, and shipping it to hotels for summertime usage and cooling before the advent of refrigeration.) The Rustman Estate consists of the "big" house. a smaller guest cottage, several farm buildings, two workers' cottages, a boathouse, a one-lane bowling alley, and wide pastures, garden plots and wooded areas. The porch on the house itself faces west and winds three-quarters of the way around the first floor. Inside there is a smallish kitchen but a dining room that seats 18-20 guests, a large living room, billiard room, butler's pantry, billiard room, and separate two-room maid's quarters. On the grand staircase was a stained-glass window (now removed) featuring an Eve-like maiden offering the viewer an apple. Upstairs, a vast master suite has been created from some of the original five upstairs bedrooms, each with its own marble sink. The third floor is the attic with a turret room high above Silver Lake where Mrs. Rustman would sit and watch the ice-cutters. The Rustman House awaits its next occupants as it has been unoccupied for several years and remains protected by a chain-link fence and hidden security devices.
The trivia item below may give away important plot points.
(at around 1h 8 mins) When Ryan Reynolds' character breaks through the wall into Ketcham's evil sanctuary and starts to see "ghosts", the third entity clearly resembles Gollum (Smeagol) from the Lord of the Rings. He's even crouching very much like Gollum in his cell, complete with a few strands of hair, bright blue eyes, and loin cloth.