History Film / OneHourPhoto

* AmateurSleuth: Sy discovers Will's affair by studying both the photos in his collection and the photos that Maya recently dropped off, apparently having realized that he's seen her somewhere before.

* BeneathNotice: Sy is so nondescript that most people don't notice anything strange about his behavior unless he raises his voice, a fact that he exploits when posing as room service at the hotel. For good measure, he also wears extremely bland clothes that blend with the surrounding environment. [[note]] This worked so well that, according to the director, members of the cast and crew would sometimes lose track of Williams between takes![[/note]]

* BigScrewedUpFamily: Contrary to what Sy initially perceives, things are not quite right with the Yorkin family, specifically that Will has been carrying out an affair on the side. The stability of the family begins fraying further after Sy becomes directly involved with it following is discovery of said affair.

* BrokenPedestal: Sy greatly admires Will, given that he has the life he aspires to, even coming across as slightly awestruck when they meet in person. Once he discovers Will's affair, however, Sy is clearly disillusioned and immediately removes his face from every single photo in his collection.

* CantGetAwayWithNuthin: Will's affair. Nina even knows about it, but still wants to get in touch with him for his safety.

* DidntThinkThisThrough: Sy makes copies of every one of the Yorkins' pictures to add to his collage. However, the machine he uses to develop the photos automatically logs these things, and when his boss discovers that he's been making hundreds of unauthorised and unpaid-for prints, he is fired.
* DisproportionateRetribution: Sy's explosive response to the technician's apathy, [[spoiler: his own firing, and Will Yorkin's adultery]] are far more than what a sane person would consider justified.

* HypocriticalHumor: After sneaking evidence of Will's unfaithfulness into Nina and Jake's photos, Sy follows them home and, ''while spying through their windows from a car across the street'', expresses frustration with Nina's failure to confront Will.

* NightmareSequence: Sy has one that makes for arguably the most disturbing visual in the film. [[spoiler:He stands in a completely empty, white department store aisle with his eyes closed. The camera keeps fading in closer until he opens his eyes... that are ''completely blood red.'' All sound cuts out at this moment, making it [[JumpScare all the more startling]] when he grabs his face and screams as [[HighPressureBlood blood shoots from his eyes]].

* ProperlyParanoid: Though you ''can'' still shop at a place you were fired from (albeit it would be awkward), Bill is worried that Sy is up to something bad when he does this -- believing that he may be there to harm the business or at worse, ''someone'', as Sy has been prone to acting on emotion and was upset when he got fired. As such, he has the security guard keep an eye on him. [[spoiler:He's right; Sy is there to threaten Bill and his family.]]

* RemovedFromThePicture: Will's eyes are scratched out of every single photograph in his StalkerShrine after Sy discovers his infidelity.

** It gets even worse when he discovers Will's infidelity; he goes over the wall of photographs and methodically scrapes Will's face out of ''every single picture'' with a razor blade.

* StealingFromTheTill: After some odd occurrences with Sy, his boss looks over his orders for the last several years and finds out that Sy had made multiple photo copies that hadn't been paid for, which leads to him firing Sy as a thief. We know from very early on that all of the copies are photos of the Yorkin family, but it still doesn't prepare people for the sheer amount of them in the RoomFullOfCrazy.

* TheVillainKnowsWhereYouLive: After Sy gets fired from his job at the [=SavMart=], he shows up one more time to get a roll of film developed. The pictures are all photos of the manager's daughter, in her front yard. Upon seeing these, the manager immediately calls the police.