Trivia: When Jesse and the detective are in the upper room with all the dolls in the theater, in a wide shot you can see the doll from the Saw films.
Trivia: The making of the film was a troubling experience for writer Leigh Whannell and director James Wan. The story was created at the last minute for a pitch to studio executives who wanted to hear something from the "'Saw' guys" (even though they had no concrete ideas at the time), but after the project was greenlit, Whannell found it difficult to write as he was not fully passionate about the project and didn't expect them to give the go-ahead to make it. Upon completing the first draft, he then spent well over a year doing copious re-writes over and over to appease various increasingly harsh notes the studio gave him, including notes he felt made no sense. (Ex. The executives in charge kept pushing him to create "rules" to make the story more grounded and realistic even though it was a story about an abstract ghostly curse.) Eventually, an uncredited script-doctor was brought in to re-write the film, and Whannell has stated that the finished film is a mish-mash of his ideas and the script-doctor's. The shoot ended up being hectic and troubling for director Wan, and a great deal of content was cut from the film, including a good deal of the twist finale and a good deal of the backstory related to the various villains. Whannell has said that although the project was a failure in his eyes, he would do it all over again because it taught him many valuable lessons about filmmaking.
