History Film / SawIV

* GriefInducedSplit: John Kramer fell into grief when [[spoiler:his then-wife Jill Tuck suffered an untreatable miscarriage of their soon-to-be-born son Gideon, to the point that he cut social ties with most other people, including his friend and business partner Art Blank.]] Downplayed in that while he and Jill ended up divorcing, John still cared a lot for her.

* HotBlooded: After [[spoiler: Perez is seemingly killed by the Billy puppet, Agent Strahm can barely keep his rage in check, and we get flashes of his inner mental turmoil as he interrogates Jill for the final time, with brief flashes of him thinking about pointing his gun at Jill, slamming the wall next to her head, and screaming at her. He manages to keep it mostly together and somewhat subvert the trope.]]

* EveryoneHasStandards: Rigg may have ChronicHeroSyndrome, but he clearly has no sympathy or pity for the cruel serial rapist Ivan.

* DetectiveMole: [[spoiler:Hoffman, presumed as one of the major cops throughout the majority of the film, is revealed at the end to have been a Jigsaw apprentice all along.

* RememberTheNewGuy: In the third film, Hoffman was in a single scene as a forensics tech (even credited as Forensic Hoffman.) However, in this film, he's suddenly a seasoned detective and the lead investigator of the Jigsaw case.

* DrowningPit: Strahm is placed in a portable version, with a glass box locked around his head that starts filling with water. He survives by giving himself an emergency tracheotomy with a pen, allowing him to keep breathing until the police can find him.

* DeadpanSnarker. Agent Strahm, especially in the interrogation scenes with Jill.
--->'''Strahm:''' "Okay, let's review. Girl loves boy, boy loves girl, boy gets girl pregnant, girl loses baby, boy turns into a serial killer...Jill...I'm not buying it."

* FacialHorror: [[spoiler:After going through the Knife Chair Trap, Cecil's face is caked in blood.]]

** [[spoiler:Jeff draws his pistol (which was ''empty'' at the time) on an armed FBI agent who warned him to stand down. Although to be fair, he was definitely not in the right state of mind with everything he went through.]]

* TheMenInBlack: Played with. Strahm's uniform is a black suit and white shirt with a black tie, and while he never acts particularly sinister, is impatient with the Metropolitan Police Department over their failures in catching Jigsaw, and isn't pleased to see that Kerry, who served as an informant to him and Perez, was killed.

* AmoralAttorney: Art Blank is revealed to have [[spoiler:successfully defended a rapist, a pimp, and an abusive husband and father]].

* TheMenInBlack: Played with. Strahm wears a black suit and white shirt with a dark tie, and while never acting particularly sinister, is impatient with the local police department over their failures in catching Jigsaw and is none to pleased that Det. Kerry, who was secretly working with him and Perez, was killed.

* SomberBackstoryRevelation: John's ex-wife Jill being interrogated by the police and FBI. Over the course of the line, Jill reluctantly tells numerous past events that led to John becoming Jigsaw (including her miscarriage of their child), adding to John's own claims about his motivation in ''Film/SawII''.

* POVSequel: [[spoiler:The climax reveals that most of the film's events have been taking place at the same time as ''Saw III'', but in different locations. This is only explicitly shown when Strahm runs into Jeff, the protagonist of ''III'', in the Gideon Meatpacking Plant. Rigg, despite also entering the plant, doesn't witness anything related to the plot of ''III'', with the exception of Kerry's corpse (which was outside the plant).]]

* EvilAllAlong: [[spoiler:Hoffman]] was another Jigsaw apprentice.

''Saw IV'' is the fourth film in the ''Franchise/{{Saw}}'' horror film series, released on October 26, 2007 and directed by Darren Lynn Bousman. It was the first in the series to be written by newcomers, Marcus Dunstan and Patrick Melton, based on a story co-written with Thomas Fenton, after series co-creator Leigh Whannell was reportedly disinterested in writing any more films.

''Saw IV'' is the fourth film in the ''Franchise/{{Saw}}'' horror film series, released in 2007 and directed by Darren Lynn Bousman. It was the first in the series to be written by newcomers, Marcus Dunstan and Patrick Melton, based on a story co-written with Thomas Fenton, after series co-creator Leigh Whannell was reportedly disinterested in writing any more films.

* TheFarmerAndTheViper: As how she was ordered by Jigsaw, Brenda tries to kill Rigg after he saves her.

* SimultaneousArcs: At the end of the film. it's revealed that [[spoiler:the film's events have been occurring simultaneously with those of ''Saw III'']].

* AscendedExtra: Hoffman was introduced briefly in the third film as a crime scene technician, even credited as Forensic Hoffman. However, in this film, likely because they'd killed off pretty much every other leading or supporting character in the previous installments, Hoffman is suddenly a seasoned detective with the department and plays a major role in the film.

* TheReveal: Two of them.
** [[spoiler:The film's events take place at the same time as the events of the previous film.]]
** [[spoiler:Hoffman is another apprentice of Jigsaw.]]

** Jeff draws his pistol (which was ''empty'' at the time) on an armed FBI agent who warned him to stand down. Although to be fair, he was definitely not in the right state of mind with everything he went through.