Trivia: In the film, the two transfer students are Kiriyama, the silent killer, and Kawada, the winner of a previous Battle Royale. In the original novel, only Kawada was the transfer student; Kiriyama was in the same class selected for this game of death. He was the main antagonist.Allister Cooper, 2011
Trivia: The picture on the computer of the hive looks like an upside down umbrella and the name of the corporation who own the hive is ... the Umbrella corporation.
Trivia: Bill Skarsgård was purposely kept separated from the child-actors during filming, and outside of some early publicity photos, the kids never saw him until the first scene they filmed together in order to get their genuine reactions. The kids were both genuinely scared of him, but also incredibly excited after filming their first scene.
Trivia: When James Brolin was offered the role of George Lutz, he was informed that they didn't have a script to give him. James bought a copy of the novel and began to read it. At two o'clock in the morning, while reading a very intense part of the book, a pair of pants that he had hung up earlier fell to the ground causing him to jump in fright. After that, James agreed to do the film.
Trivia: Although it lasts for only 45 seconds on screen, the stabbing scene in the shower took seven days to shoot and used 70 different camera angles.
Trivia: The actor playing Adam is actually a co-writer of Saw. The film was shot in 18 days and for under a million dollars, and it all took place in 2 warehouses. The writers/directors wanted to make a movie about people trapped inside a single room.