The whole film was essentially shot in one location, a converted warehouse, where the bathroom set was built. All the other locations were made from existing rooms and dressed them. Shot in 18 days.
All of the bathroom scenes were shot in six days.
The actors had absolutely no rehearsals. The rehearsal takes were actual footage for the film.
カネがなくても知恵があれば大丈夫? The demo scene James Wan and Leigh Whannell shot to present to Hollywood producers was the "reverse bear trap" scene, with Leigh in Shawnee Smith's place. The trap used in the demo scene was made by Wan's industrial designer friend and would have actually been functional and able to tear a person's jaw off if manipulated correctly. ↑ 逆トラバサミ