- Saw IV (2007) was given the green-light before the third movie even opened. This was stated in Fangoria Magazine #257: "The synopsis, bare as it is, takes the third installment to a new budget level for Lionsgate's wildly successful franchise. Saw (2004) was made for approximately $1 million, Saw II (2005) cost $4 million and the figure for Saw III (2006), according to producer Mark Burg , has risen to $10 million. Saw III was green-lighted the morning after Saw II opened to massive box-office returns, the producer confirms, "and when they ordered Saw III, they also ordered and green-lit Saw IV."
- Sent to theaters under the name "Angel Fish".
- The dog that Ivan is seen hugging and kissing is director Darren Lynn Bousman's dog named Chance.
- Is the first movie in the ‘Saw’ series not to be written by ‘Saw’ co-creator, Leigh Whannell.
- Though producers wanted Donnie Wahlberg to reprise his role, his schedule made him unavailable and his character was not included in the original script. However, after shooting began, his schedule freed up, and the script was re-written to include his character.
- The little girl that Rigg talks to, during the child abuse scene in the school is Alison Luther, who is the niece of director Darren Lynn Bousman.
- Filmed in 32 days.
- The photos seen in the room where Ivan is tested are of Darren Lynn Bousman's girlfriend, his assistant, and of his lawyer.
- Darren Lynn Bousman was originally not interested in directing the fourth installment in the Saw series, but the producers persuaded him to read the script anyway. Bousman decided to take the directional duties when a plot twist in the script took him completely by surprise, something he thought impossible after being involved in the Saw series for three years.
- As part of a running gag in the Saw series, the filming crew always hides what they call a 'fart machine' in one of the sets, and make it go off in a particular serious scene, to see how long the actor or actors can keep a straight face. This time, 'Liriq Bent' was the victim. He actually managed to remain in a character a couple of seconds before bursting into laughter.
- The seamless transitions between separate scenes in the movie were not created using (digital) visual effects, but were done practically. For these transitions, the sets were build in such a way that two separate scenes could be filmed in one shot without interruption.
- When the results from the fingerprint analysis from the bullet come in, two other names can be seen on the sheet that matches the fingerprint on the bullet to Officer Rigg: "Entry Employee: Scoffield, Sean" and "CSI Case App: Armstrong, David". Sean Scoffield is in charge of doing the graphics for Saw IV, and David A. Armstrong is the Director of Photography.
- Producer Mark Burg has stated this "Saw" to be his favorite on the commentary track.
- Is the first film in which Jigsaw swears.
- This first installment of the franchise which does not open with a character in a trap.
>>> WARNING: Here Be Spoilers <<<
Trivia items below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- SPOILER: This film marks the second time in the Saw series that someone other than Jigsaw (in this case Hoffman) says "Game Over" in the movie's climax.
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