* It's pointed out subtly several times in the game that Greenvale has a lot of stuff in it (art gallery, big fancy hotel, sawmill, two bars...) despite being a relatively quiet small town. This is foreshadowing [[spoiler:that Greenvale used to have a larger population that was killed off by Kasen's experiment.]]
* York's invisible friend Zach is actually you, the player.
** Quite the observation. [[spoiler:Wouldn't you agree, York?]]
** [[spoiler:Except that the game establishes near the end that this is not true.]]
* When York opens a door he quickly looks around before going in. Why? To look for any threats before actually going in. Looks like he has been jumped before.
** Becomes even more brilliant when you see [[spoiler: the flashback to when Kaysen attacked Zach's family. Zach was watching from a doorway where he couldn't immediately see Kaysen, so York's cautiousness is a defense mechanism for his trauma as well.]]
*** Not only that, but York's signature mannerism of putting two fingers to his temple while saying "Don't you agree, Zach?" is him mimicing [[spoiler: his father's last words and actions before shooting himself in the head]].
* Kaysen's [[spoiler: final form]] makes sense: [[spoiler: He doesn't need to look like a monster to ''be'' a monster.]]
* During the autopsy scene, when York finds out that Emily was watching a movie on TV the night of the murder, he grinds his investigative questioning to a halt to ask her what it was and then rattle off the year and director before moving on. Seems like just another case of [[PopCulturedBadass York]] [[CloudCuckoolander being York]], until you poke around Emily's house and car (with a particularly telling vanity plate) and realize something about her: [[spoiler: She's just as huge a film buff as he is. This seemingly-innocuous moment is probably when she starts to fall for him, because she realizes that they actually have something in common.]]
* During one of the car chats in Episode 3, York is trying to work out what his feelings for Emily are. He tells Zach that she reminds him of "something he used to feel"--the feeling of wanting to protect someone, but at the same time, feeling protected ''by'' them. He wonders out loud: "Who used to make me feel that way...?" [[spoiler: It's Zach himself. York is Zach's protector, but at the same time, Zach still helps guide him and keep him anchored in the real world.]]
** It could also refer to [[spoiler: his guilt toward his mother's death, and point to a desire to protect Emily to make up for how he believes he failed his mom.]]
** Though we only see the lower half of her face, [[spoiler:Zach's mom seems to look a lot like Emily]].
* During the section where [[spoiler: you play as Emily]] why can you suddenly run indefinitely without the meter filling up and forcing you to stop? It's because [[spoiler: Emily isn't a smoker like York]].
* At the end of Quint and Becky's sidequest, York says "another young life saved Zach, good job". [[spoiler: Remember that in reality, York is an alternate persona and all utterances of York and Zach reversed; so the line is actually "Another young life saved York, good job", delivered by Zach, the true persona. Who was the previous young life that York saved? ''Zach himself''.]]
* When Anna's ghost leads you to the [[spoiler:Galaxy of Terror]], she needlessly takes you around in a circle before getting you there. Carol described Anna as [[TheDitz a ditz]] earlier in the game, so in that light it makes sense that her ghost would take you where you needed to go in such a roundabout way as opposed to the obvious quicker way.
* When York finally enters George's house, [[spoiler:we find that it's very messy and under-furnished, with all the windows boarded up]]. On the surface it just seems like [[spoiler:the type of place you would expect a serial killer to live]], but looking deeper, [[spoiler:it perfectly reflects several aspects of George's psyche: The messiness reflects his psychosis, the under-furnished state reflects how he had virtually nothing good in his life, and the boarded up windows reflect how he hid his true self from the outside world]]. Also, [[spoiler:the boarded up windows prevent George from seeing the outside from within, reflecting how blind he was to certain things- namely that Kaysen had manipulated him into becoming a killer]].
* Michael's sidequest reveals that [[spoiler:he is Harry's adopted son]]. In this light, [[spoiler:Michael can be viewed as Harry's [[ReplacementGoldfish replacement]] for George, Harry's estranged biological son. George himself takes after Harry in this one respect as George was using Carol and Thomas as [[ReplacementGoldfish substitutes]] for Emily, the woman he loved but couldn't have. Like father, like son]].
* With a huge dollop of FridgeHorror: [[spoiler:it's heavily implied that Kaysen put the sapling inside Emily by raping her]]. He ''literally'' spilled his seed there.
* A couple of realizations concerning York's love of punk:
** He and Zach didn't exactly like the same bands, but they both dislike the Sex Pistols. York never actually explains why, but here's a possible theory; what was their lead singer's claim to infamy? [[spoiler:Allegedly killing his wife]]. Probably hits too close to home for York.
** Up to the present day, York still likes punk, as evidenced by his theme song (which plays when you're driving in his car, as well as during the racing sidequests) sounding very suspiciously similar to Green Day's "American Idiot".
* When you are at the final battle, [[spoiler:Zach]] ends up running DOWN a whole flight of circular stairs away from [[spoiler:Kaysen]], only to end up at the TOP of the roof of [[spoiler:the clock tower]]... huh?
** Well, given that [[spoiler:Kaysen is implied to be an Eldritch Abomination, and he might very well be warping space-time,]] combined with the whole ThroughTheEyesOfMadness thing in the dark world, there's at least two reasons why this might have happened.
* [[spoiler: In Spy Fiction, Kaysen is killed by Lauder. This never made any sense to me, because he was still alive back when the gas was released meaning he was super paranormal for a while. If that's the case, how did the Lauder kill him. If the Lauder did kill him, either the events of Greenvale shouldn't happen, or Spy Fiction took place after DP and never happen because Zach killed Kaysen.]]
** [[spoiler: This is because Kaysen is part of SWERY65's ReusedCharacterDesign group. Deadly Premonition and Spy Fiction are not canon to one another. The same thing goes for General too, who was eaten by piranhas.]]
* During the second victims death York just stands there watching her die. Alright he made a mistake assuming she was dead the first time I can forgive that (although he does the same damn thing for the third victim too) but after seeing she was alive and after the trap had been sprung he didn't think, maybe he should attempt to support her weight to stop her strangling to death two feet in front of him. Don't say it was an instant death either, we clearly see her still alive even before York starts seeing things from behold the grave.
** By the time the trap is sprung, it's too late...It's not INSTANT, but, like with 'Power Rangers' transformations and such, it's quicker then it looks.
** Not to mention that [[spoiler:the murder was ''literally'' committed in front of them, and Emily and York didn't know it]].
* Given the method we see for creating red tree saplings, does that mean there's someone buried in a shallow grave under [[spoiler: George's]] lawn?
** That's just the methods to get the seeds to ''sprout''. After becoming saplings, they can be planted like regular trees.
** Although that's not the only fridge horror at George's house. [[spoiler: Remember his mother's corpse in the basement? Kaysen most likely raped her. Is ''that'' why George become so fanatic about the red trees?]]
*** More FridgeHorror comes in when you consider the possibility that it ''wasn't'' [[spoiler:Kaysen who raped his mother]]... Guess he might have gotten back at her for all of those beatings...
* If you check the Galaxy of Terror late at night, sometimes you can see Thomas or Carol head to a room you can't enter. If you check the map you'll notice they're with someone else [[spoiler: George, and later you find out that it's the secret BDSM room. With the way the game treats Thomas as a fellow victim despite his antagonism and death at your hands, and his comments on George's cruelty]], you realize that meek and gentle ShrinkingViolet who cooks lunch for you daily [[spoiler: is a LoveMartyr who was probably being sexually and physically abused]] right under your nose the whole time, and it's implied [[spoiler: his eventual psychosis is partly the result of BreakTheCutie]].
** Likewise, Carol's abrasiveness [[spoiler: may also be the result of similar abuse]].
* Pay close attention to Brian Xander Morgan's gun, it's a magnum, now take note the prize in [[spoiler: Willie's Doghouse]] after completing his sidequest with all seven bones, a magnum. [[spoiler: Kaysen likely stole that Magnum from Xander's dead body.]]
* It's mentioned that Forrest Kaysen is particularly close to the Ingram family, especially Isaac and Isaiah. [[spoiler: Considering his modus operandi, what are the chances that he's plotting to make Lily his next victim]]?