- Around 100 different copies of Rose's outfit were made. It started out with soft summery colors and as the movie progressed it became grayer and eventually blood red. The change in the outfits were so subtle that it was barely noticeable.
- Sony acquired United States and Latin American distribution rights for $14 million US Dollars.
- Many of the creatures in the film were played by dancers so they could be flexible enough to create the required disturbing movements.
- It took director Christophe Gans five years to obtain the rights to make the film. He was given the rights after he sent Konami a video of an interview describing how much Silent Hill meant to him. Along with the interview, he sent scenes that he filmed on his own dollar cut up and overlayed with music from the games.
- In the original script, there were only female characters. After submitting this, the script was returned to Christophe Gans with a memo saying "there are no men!". Sean Bean's character was added and the script was approved.
- The version we see in theaters is the one director Christophe Gans wanted us to see. He said in an interview that the studio executives loved his version, and he was never asked to cut down his film length. Although the initial script of the film was expected to be 3 and a half hours, the film was never shot with that length in mind.
- The cellphone used by Chris (Sean Bean) is a Sony-Ericsson Z600.
- Christophe Gans originally wanted Cameron Diaz to play the part of Cybil.
- French director Nicolas Boukhrief was involved in the writing of the screenplay.
- In the final scene, when the congregation has gathered, a phrase written in Latin is visible around the ceiling of the main chamber. It reads, "Domine Deus Omnipotens in Cuius Manu Omnis Victoria Consistit...” Translated this is "O Lord God Almighty, in Whose Hand all Victory Rests...” This is a portion of an old English Prayer from the Pre-Conquest period. The rest may read "... and all war is destroyed, grant me that Thy hand may strengthen my heart so I may fight well and act courageously so my enemies may fall before my sight."
- Apart from "Ring of Fire" by Johnny Cash every piece of music is directly from the game series
- Dancer/choreographer Roberto Campanella not only played as creatures Pyramid Head, the tortured Janitor, and Colin (the janitor from 30 years ago), he was also movement coordinator for all of the creatures and oversaw how they performed the movements for their respective characters (i.e. Grey Child, Dark Nurses and Armless Man).
- When auditioning to Roberto Campanella as the "Armless Man," Michael Cota performed with a makeshift mask and his arms behind his back.
- Radha Mitchell (Rose) never actually saw Yvonne Ng's face, as she was always in the "Grey Child" costume.
- Radha Mitchell (Rose) got punched in the face by one of the "Dark Nurses" during filming the scene in the basement of the hospital.
- The weapons we see being used by the men with gas masks are metal pipes. The metal pipe is one of the first weapons encountered in the Silent Hill games.
- There were a total of 165 sets and locations used for the film.
- The prayers recited by Christabella and the citizens of Silent Hill within the church in their effort to keep the dark side of Alessa at bay are actually lines from Revelation, a book in the New Testament of the Bible.
- The theater in Silent Hill is playing a double feature of the Vincent Price vehicle, The Last Man on Earth (1964) and its remake The Omega Man (1971), starring Charlton Heston. Both of these films were based on Richard Matheson's story "I Am Legend".
- In the witch burning picture in the church crew members for the movie were painted as spectators watching the burning.
- Filming in Brantford, Ontario, Canada lasted four days. The decaying downtown strip that was used for most of the film is a section of Colbourne St. It was picked as such because not many modifications were needed as that area of the downtown was already in a state of decay (but has since been cleaned up considerably) and consisted mostly of abandoned buildings that could be 'dressed' easily for filming.
- When Dahlia asks why Alessa didn't take her along with the others Rose says "Because you're her mother, Mother is God in the eyes of a child" at the end of the movie. There is a similar line spoken in the movie The Crow (1994) where Eric Draven says "Mother is the name for God on the hearts and lips of children".
- In the hospital the nurses are attracted to light just as the monsters are in Silent Hill 2 (2001) (VG) and Silent Hill 3 (2003) (VG).
- The insect creatures that attack Rose and Cybil are the same insects that attack James Sunderland in Silent Hill 2 (2001) (VG) in the elevator.
- Centralia, Pennsylvania was the inspiration for the movie adaptation of the game Silent Hill. In researching the different elements of Silent Hill, screenwriter Roger Avary came across the town of Centralia, Pennsylvania, an almost abandoned town with a 40 year old coal fire burning underneath it. Centralia planted the seed for what developed into the cinematic version of the town of Silent Hill.
- Roberto Campanella, when playing Pyramid Head, wore 15-inch heels to make him close to 7 feet tall.
- At the beginning when Rose runs under the overpass, the name "Cheryl" is spray-painted on the side. Cheryl was the main characters daughter in the game "Silent Hill", which the movie is based on.
- One of the stores visible in the movie version of Silent Hill is called "M.T. Rooms" - An inside joke referring to the fact that in both the film and the games, most of the structures are mere facades with nothing behind them (Empty Rooms).
- In Portugal, this movie was released under the title "The Curse of the Hill" ("A Maldição do Vale", in Portuguese), but most game-based movies don't get their titles translated.
- In the film, Silent Hill is a desolate ghost town that had been abandoned because of a dangerous 30-year-old coal fire burning in the mines under the town. Screenwriter Roger Avary used a real-life town as the inspiration for Silent Hill: Centralia, Pennsylvania. Centralia is almost completely deserted due to a mine fire burning right under the community for 40 years. Avary saw what Centralia had become, as well as its history, and decided to use its past as the basis for Silent Hill.
- In the room where Rose encounters Alessa scribbling furiously on a desk, the cult symbol from the games can be seen on the wall behind her, just before Rose runs across the catwalk.
- When Rose is arrested the camera pans behind the Jeep showing the Ohio license plate "C3J 46E5" with a county code sticker "75" in the bottom left corner indicating Shelby County, Ohio. The license plate is a custom plate as in that standard issue plates are formatted as 3 letters and 4 numbers (AAA 0000) and was registered after 2004 because Ohio license plates changed formats in 2004.
>>> WARNING: Here Be Spoilers <<<
Trivia items below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- SPOILER: The line from Sharon "Don't talk to strangers" is lifted directly from Heather in Silent Hill 3 (2003) (VG) (who in the game, turns out to be Cheryl, the character whom Sharon is based on).
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