* CompleteMonster: See [[Monster/Suda51 here]].
* MagnificentBastard: "Case #3 Parade" & "Report #3 Tsuki" have the other two members of the Mikumo Boys:
** [[SilentAntagonist Fuyuki]] is TheHeavy of the Mikumo Boys' scheme whose mouth was sewn shut by the Mikumo 77 villagers. Effortlessly kidnapping Chairman Yukimura and holding him hostage, Fuyuki requests a 6 billion yen diamond paid by the Yukimura Corporation under the threat of harming him. Luring the HCU to an industrial warehouse and forcing the player to waste time going through random hurdles to reveal his location, upon acquiring the diamond, Fuyuki [[SelfDisposingVillain commits suicide]] by jumping down a smokestack, destroying the diamond and bankrupting the Yukimura Corporation in the process.
** [[GeniusCripple Hanao Hiseki]] is a bomber who was [[EyeScream blinded]] by the Mikumo 77 villagers. A [[TheCracker computer wiz]] able to use special technology to get around his blindness, Hiseki is responsible for blowing up Chairman Yukimura's mansion in order to get the HCU's attention, killing himself before he can be arrested. During his spare time, after mistakenly receiving an email from Tokio Morishima, Hiseki decided to [[{{Troll}} prank the journalist]] by posing as "The Bat", making Tokio solve Mother Goose-themed riddles with the false promise of revealing his location. Upon Tokio's completion, Hiseki emails him after his suicide revealing the truth, while [[FriendlyEnemy admitting he was a fun spectator]].
* ThatOneAchievement: "Your score is in your heart". This one requires the player to answer all of Morikawa's rapid-fire 100 quiz correctly in #2: spectrum. Yes, ''all of them''. And just to make things more difficulty, you have a few seconds to answer every individual question. Get one wrong, and you're not getting the achievement. Hope you saved before the quiz.
* ThatOneLevel: The Triangle Towers in Lifecut are very unfondly remembered for taking Decoyman's Shelter exhibits level--making you explore 5 or so small shelters--and expanding it into making you explore ''10 identical towers''. Although they have StoryBreadcrumbs [[spoiler:(and dead bodies)]] in them, the legwork is mostly long and uneventful.
* UnexpectedCharacter: The "YAMI" chapter is a SequelHook for ''VideoGame/FlowerSunAndRain'', so many were expecting a character from that game to make an appearance. Absolutely nobody was expecting it to be [[spoiler:Catherine ''as a person'', since in ''FSR'', no indication is ''ever'' given that Catherine is anything more than Sumio Mondo's CompanionCube briefcase]].
* ValuesDissonance: Modern day players might be uncomfortable with how casually ableist and homophobic slurs are thrown around by the characters, but it is reflective of the time period the game originally released in where such attitudes were considered fairly common.