Trivia: To make the water in the glass on the dashboard 'jump', they strung a guitar string from the underside of the dashboard to a bolt on the floor and then plucked the string.
Trivia: According to the Director's commentary, Twentieth Century Fox Film Corporation did not want the film to be released under the title "Independence Day" to avoid legal complications (specifics weren't disclosed as to what the problems might be, but it's also why the abbreviation "ID4" was used). Roland Emmerich (director/writer) and Dean Devlin (writer) needed to justify the title, so they added the rousing bit right at the end of President Whitmore's speech at the hangar when he ends with, "The 4th of July will no longer be known as an American holiday...today we celebrate our Independence Day!"
Trivia: Producers Gale Anne Hurd and Sam Mercer wanted to film the movie at the American Museum of Natural History in New York. However, the museum's administration was afraid that the film would not only cast the museum in an unflattering light, but it would also scare kids away from the museum. They were given permission by the Field Museum of Natural History in Chicago to film there, because they loved the movie's premise.
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.
Trivia: There are several places where Edward Norton sees Brad Pitt for a split second before he actually meets him - beside the photocopy machine, talking to the doctor, at the testicular cancer group, when Marla is in the alley, and when watching TV when the waiters say "Welcome". Also Tyler is the one who steals the Camaro after Tyler and the narrator meet for the first time.
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.
Trivia: When the "pizza boy" is stopped by the drag racing, the driver is Rob Cohen, the film's director. (00:15:48)
Trivia: All of the guards at the clinic on the mountain have the Olympic rings on their orange track suit tops.