!!FridgeBrilliance
* The opening scene gives an exact characterization of Somerset's thinking patterns and reasoning in comparison to those of the people around him. When investigating the murder-suicide in the beginning, he sees children's drawings on the fridge and asks if the child saw the deaths, much to the chagrin of the officer accompanying him. What the officer doesn't realize is that, if the child saw it, their testimony could be the difference between this being labeled a murder-''suicide''...or a ''double'' murder.
* How skewered Doe's interpretation of Christianity is becomes even more apparent when you realize that most of Doe's theology comes from post-Biblical sources and even fictional literature not recognized as canonical by any church. What Biblical references he does make are fairly vague and common knowledge to a layman. It shows how little he actually knows/cares about actual Christianity, using the themes as more of an excuse than actual inspiration.
* Doe's MO of turning the sin on the sinner seems to fall apart with the Sloth victim. Yes, the victim is a sinner (a drug dealing pederast according to Doe) but those crimes don't appear exactly slothful. However, the idea is that drugs allow one to escape from reality, rather than dealing with their real lives, particularly in the case of marijuana, heroin, or opiates. It's also possible Doe thought that Sloth became a drug dealer because he was too lazy to find a legitimate job.
* At the press conference, the district attorney declares that the resolution of the case will be an example of "swift justice". "Justice" doesn't get much swifter than if, just ''hours'' after turning himself in, the self-confessed and proven culprit gets shot in the head (even if it's ''exactly'' what he wanted).
* The Lust victim isn't just the poor girl tied to the bed, it's also the man forced to rape her. He could have just chosen to take the bullet and died, and spared both of them the horror of what happened instead; most of the Sin victims have a similar choice in front of them. Gluttony could have just chosen to not eat the spaghetti. Outside of Greed's apartment, there's a man counting a massive wad of bills, implying that Greed's choice was to either give up all his cash, or a pound of flesh, and we know what choice he made, so it was probably John Doe who gave him the money. Pride could have lived with her disfigured face. In John Doe's twisted religious moral framework, what he's really doing is giving the victims an opportunity to ''repent'', at the cost of their lives, the idea being that if they can prove capable of resisting their sin, they should immediately die before having a chance to stain their hands again. It even works that way at the end, with Mills having the choice to simply not kill him out of anger.
* It seems highly unlikely that Mills would face any real legal punishment for slaying John Doe; the only witnesses present were other cops, Doe had openly confessed his crimes and done as much as possible to erase his own existence, and even if Mills was put on trial, it's doubtful a jury would send him to prison after learning the context of his actions. Meaning, John Doe ensured that Mills won't be able to atone for his murder and will be forced to live with his guilt.
* It’s very dubious how much John Doe really envies Mills and his “normal happy life.” It definitely comes across much more like it was just an excuse to goad Mills into becoming Wrath. However when Somerset points out that he can’t exactly consider himself a martyr since he clearly enjoyed the sadistic nature of his “work” Doe is left speechless for the only time in the movie and with a wry smirk eventually acknowledges that he did enjoy it. In other words he genuinely did admire, or envy, Somerset for being on such a high intellectual level.

!!FridgeHorror
* When John Doe reveals that he murdered Tracy, his exact words leading up to TheReveal are "I tried to play husband. I tried to taste the life of a simple man." This implies that before he killed Tracy he tried to [[RapeIsASpecialKindOfEvil do other things to her as well...]]
* John Doe killed Tracy, Mills' wife, shortly after Mills left for work. That means he broke into their apartment and cut off Tracy's head in either the early morning at the earliest, or mid afternoon, seeing as how it was well before dusk (7PM) when Mills and Somerset take John Doe on their little drive. One might well ask why no one reported, or at least noticed some suspicious noises or commotion in the Mills' home. The explanation? The frequent subway train traffic ''muffled all noise''. Poor Tracy could have been screaming bloody murder at the top of her lungs, and no one would have heard her.
* In the scene in Wild Bill’s Leather Store, Wild Bill tells Mills and Somerset that he made the knife-dildo for a man with a limp. Meanwhile a limping man with an umbrella can be seen outside the shop, stopping to look at the detectives through the glass door. Mills turns around and looks at him at one point. As him and Somerset begin to leave the man limps away. Just a curious man passing by the store? Or John Doe himself keeping an eye on the detectives? Seeing as how this is a Fincher movie it’s more likely to be the latter.
* John Doe shaved off his fingertips at regular intervals to prevent himself from having any fingerprints that could be used to ID him or connect him to previous crimes. Once jailed it would be only a matter of time before his fingertips grew back. John Doe needed to compell someone to kill him and soon in order to prevent his fingertips from growing back and to avoid going to Hell for committing suicide.
* The theme throughout the movie is that we are living in a CrapsackWorld. John Doe takes a taxi, and then WALKS INTO A POLICE STATION covered in blood and nobody even notices until he has to literally scream at them! This might seem like a case of FailedASpotCheck or UnusuallyUninterestingSight. But it also drives home the point all the further of how numb everyone is to the horrors around them.
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