Trivia: When Officer Rigg is walking through the school, before he finds Morgan and Rex in the rod trap, he walks by a dark room blocked off with police-barrier-tape. Originally, there was a scene that revealed this was the room where Troy from "Saw III" died, but it was cut, presumably for pacing reasons.
Trivia: During the flashback scenes at the drug clinic, pay close attention. There are several characters from the previous films in a number of the shots. They include Paul (from the razor-room in the original "Saw"), Gus (who was killed by the gun-trap in "Saw II"), and the unnamed man who Amanda killed in the original film, among others.
Jigsaw: "Cherish your life" is the motto this whole organization is built on. Cherish your life... your life.
Question: A tape recorded by John directed toward agent Perez states that her partner would soon take the life of an innocent man. How did John know that agent Strahm would kill Jeff? For all he knows, Strahm could have followed Rigg through the factory rather than Jeff. The "if you're good at anticipating the human mind, it leaves nothing to chance" excuse doesn't work here. The only reason Strahm followed Jeff was because he heard Jeff hit a ceiling light with a crowbar.