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: 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.
Trivia: Michael Myers' mask is a Captain Kirk mask turned inside out, then painted white with ruffled hair and a few other tweaks.
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: While filming the toy clown attacking Robbie, the clown's arms were wrapped tightly around Oliver's neck. He immediately said he couldn't breathe but Steven Spielberg and Tobe Hooper both thought that he was ad-libbing. When Spielberg saw Oliver's face turning purple, he realised that he really was being asphyxiated and ran over to remove the arms from his neck.
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: When General is being chased by the St. Bernard, a red Plymouth Fury slams on its brakes to avoid hitting them. After General and the dog make it passed safely, as the Fury drives off, its bumper sticker reads, "Watch out for me. I am pure evil. I am Christine."
Trivia: When Jigsaw and Eric escape the lair via a hidden elevator, the film's low budget prevented the construction of an actual working elevator. Thus, some trick photography and editing was implemented. For the first shot of Jigsaw and Eric "going down", the scene was shot by raising the camera vertically to give the impression they were descending. For the next wide shot, simple digital effects were added to make it appear that the room was "lowering." And for the final shot where we see the top of the elevator going down an elevator shaft, stock footage from the film "Hollow Man" was used.