Let me know if you feel there's anything missing or something is inaccurate, or want a link to prove one of the entries. I mostly tried to use stuff around the game rather than lore or other parts of the game itself. If I really feel like it I might turn it into a Youtube video.
2 Animation - Devil Survivor 2 has an anime adaptation. I think it's pretty mediocre.
Manga adaption (should've written adaptations but oh well) - Lesser known than the anime, but the mangas are still quite popular, especially the one of the first game, but there's also DeSu 2: The Animation: The Manga (funny title), and DeSu 2: Show your free will.
Cain and Abel - Naoya is the reincarnation of Cain, the protagonist has bits of Abel's essence . Plot point in game but only expanded on while on select routes.
Suzuhito Yasuda - Character designer of the game, famous for his work on Yazahura Quartet, Durarara!!, and some of the Digimon games.
Spotpass content - Some demons and add-ons for DeSu 2 Record Breaker were distributed through the Spotpass system, alongside one other thing explained later.
Limited PAL releases - The first game's DS version didn't come out in Europe at all. 2 DS and 1 Overclocked both came out in 2013 in limited copies, making them quite expensive, plus PAL Overclocked had a lot of bugs on release.
DS Version skill names - Despite being far from the first Megaten game released Overseas, the original DeSu had some odd skill names not present in earlier titles, most notably Mystic instead of Curse for the element, and Rise/Jump instead of Boost/Amp.
Re-Localization - In the 3DS ports, more notably in 2 Record Breaker, the english script was changed.
Devil's Fuge Damage Misconception - It is widely believed that when you fight Beldr, the protagonist's Devil's Fuge skill scales its damage from Strength. This is inaccurate as it scales purely off catboy's level.
Unseen Clothing - A lot of the characters have design elements in their main art that aren't present in the game, like Io's red jacket in the picture.
Chinese Zodiac - Some parts of DeSu 2 like minor character design details and fate rank unlocked demons are themed after the chinese zodiac, however it was originally planned to be more focused on.
Megami Ibunroku - The game's japanese title includes "Megami Ibunroku" loosely meaning "Another Goddess' story" which was also on the title of the first Persona game.
Trimmed OST - In both versions of DeSu 1, most of the songs' lengths are shorter than the versions released on OST, sometimes missing instruments altogether (Action) or merging separate parts to play at once (Garuda).
Rape Threats - Before a battle on day 4, a Yakuza threatens to (most likely) rape Midori, which she doesn't understand.
Mai - Mai is an unused character made for the first game with a finalized design. She was supposed to be a TV reporter and a foil to Shoji, but was cut as the team had trouble fitting her in the story.
Mokiro Kitoh - Kitoh is an artist which designed the Septentriones and Triangulum in the second game, he's notable as he also worked on an angel design in Rebirth of Evangelion 2.0
8th days are unfinished - Amane's and Yuzu's eight days have small, but very obvious errors in them indicating that they were most likely rushed. On Amane's when Kaido helps as an NPC he has 0 turn speed programmed in, making him act once and then never again. On Yuzu's, a mission gives a task of protecting Midori, however she is nowhere to be found on the actual map making this goal impossible to fail.
SMT Imagine and TMS Crossovers - In the online MMO SMT Imagine you could get outfits of 1's protagonist and Yuzu, and in Tokyo Mirage Sessions one of the 2's protagonist. I now realized I forgot to include Persona 3: Dancing Moon Night, as it contains 1's protag outfit for Makoto and Yuzu's for Yukari.
Durarara!! collab - In Japan, you could get Shizuo, Izaya, and Celty from the series as demons of a unique "Exotic" race for 2 Record Breaker through Spotpass. Their data is fully present in the english versions too however, but they're only possible to unlock through manually editing your save file with a hex editor.
VA's singing the 3DS themes - Overclocked's Soul Survive is sung by the japanese voice actor of Haru (Junko Minagawa), and Record Breaker's Meguru Sekai by Hibiki's/protagonist's anime voice actor (Hiroshi Kamiya). Hibiki also narrates as the day changes, which in the english versions was changed to be done by The Anguished One.
COMPS changed last minute - Originally 1's COMPS were cell phones, however Nintendo themselves asked them to be reworked to DS-like consoles, which made the team change them last minute. They wouldn't have the balls to do it nowadays with switches for example, considering the COMPS are 1: modded and 2: pretty much illegal weapons.
Endless Battle different credits - In 2 Record Breaker's Triangulum arc if you pick the Endless Battle ending, instead of the usual ending theme it will for some reason play Break the Record, then At Last, and Meguru Sekai in succession with awkward pauses. It is the only way to hear At Last fully in-game, as normally only a short part of it plays on the title screen.
Unused E-Mails & T-STAR - In the first game there are a couple unused emails from Kaido, Naoya, Metatron, and "T-STAR" which judging by the topic and way of speaking is most likely Gigolo.
Unused Bels in 2 - In 2 you can fight and fuse Belial and Beelzebub, but in the code there's data for Beldr, Jezebel, and Belberith as well.
Miyako planned for DS version - Miyako Hotsuin was originally planned to be Yamato's sister and appear in the Septentrione plot, but was cut before returning in different form in Record Breaker's Triangulum arc.
Official Figurines - Figurines of Hibiki, Io, Airi, and Fumi exist. The Airi one has removable clothes and you can see her panties. Why?
Fusable Sariel and Anael - The demons Sariel and Anael which appear in Yuzu's and Naoya's routes as enemies have data for being fusable in both 1 and 2. Forgot to include, but Samael which appears in other Megaten games also has fusion data in 2.
Unused overworld sprites - Kresnik, Yamata-no-Orochi which appear as demons in-game have unused overworld sprites in 1. There's also ones for Girimekhala (which doesn't appear at all, and uses a different design than when he appears in 2) and an oddly purple-colored Lilim.
Early policeman design - The Policeman NPC has a full spritesheet depicting him in long sleeves, which was changed as it wouldn't make much sense for them to wear them in summer.
"Health" and "Mana" - These two are unused skills from 1 which would double HP and MP of the user respectively. Another thing I forgot - there's also Extra Zero, which appears in 2.
Real Tokyo Photos - In some promotional art of the first game actual photos of Tokyo, only recolored, appear.
The Last Seven Days - Devil Survivor 2: The Last Seven Days is a Pachislot machine themed around the game made around Record Breaker's release. It's notable for including 3d models and animations of the characters, and demons, which from what I gathered looks ever so slightly different than the models from fully 3d games. It's available for mobile too surprisingly (even being on the play store in japan) however you need an old enough Android version to run it.
Unused playable characters - There's some data for either playable or NPC characters in 1 which isn't used, like non-NPC Haru, Shoji, Mai, Shomonkai Founder, Cain, and Abel.
Unused portraits - In the data of 2 Record Breaker there's some portraits like a grandma NPC, or alternate expressions of the health exam portraits that never get used in-game.
Drama CD's - The first game as well as 2's anime have drama CD's made for them. I'm unaware of 1's, but 2's are translated and uploaded to youtube.
Physical damage formula change - "HP scaling" skills in the DS version of 1 did their damage purely based off health, like the weapon skills in Nocturne. In Overclocked they were changed to account the strength stat in as well.
The Extra World - DeSu 2 The Extra World is a now-defunct mobile gacha card game made in promotion for the DS game, launched in 2013 and shut down a year later.
Holy Ghost - an unused demon for 2. Unlike some other unused demons which either appear in the DeSu games already in some form or are in other Megaten games, we have no idea as to how this one would look, as Holy Ghost's/Holy Spirit's only appearances were in If... and Giten, both without a known drawn artwork.
Takemi Asano's death - Takemi Asano, which composed the music for 1 sadly passed away on May 12th 2020 at the age of 68. Rest in peace, legend.
Jikokuten and Raiho - In DeSu 1 DS, unused battle portrait icons exist for Raiho and Jikokuten, with the latter's design being the one from Nocturne and not one "matching" the other devas, only truly introduced in Strange Journey.
Unofficial mods - There exist a couple mods for 1, for ds version: a Spanish translation, demon race name changes, and Atsuro-Yuzu stat swap, and for both versions an OST mod restoring the full versions of songs and improving their quality which I highly reccomend using.
Dubhe Anti-Piracy - The original version of 2 uses DS Protect anti-piracy, and during the boss fight with Dubhe the fight will never progress pass the first stage where it's invincible, thus preventing the player from going any further in the game it it detects a flash cart or emulator.
"Thank you for plaing!!" - Overclocked includes three extremely strange images of Naoya (with edited colors), Yuzu, and Amane with this text, most likely used as placeholders for ending screens of their respective day 8's.
Phone cards - There were Devil Survivor-themed phone cards made by a company called Medialand. Little is known about them.
Shooting Star Maybe - SSM is an obscure one-shot manga created by Yasuda which includes characters from multiple series he worked on, including Amane from DeSu. It felt really hard to understand what was going on, and at one point, Amane gets groped. Why?
Missing Joe fate points in non-japanese versions - In DeSu 2, Joe at one point will talk about Japanese food. However the japanese version gives a dialogue choice which allows you to get a couple of fate points for Joe if you pick correctly, most likely cut due to the average overseas player not being familliar with the topic. It's as far as I'm aware only gameplay-related regional difference.
Layer 8: Layer 8 contains things I only vaguely remember or might be incorrect, take these with a grain of salt.
Yuzu's voice actor tweet - on a Discord server I got banned from long ago sadly, there was a member who shared a link to a tweet of Yuzu's japanese voice actor saying she was asked to voice Yuzu again. This is as far as I'm aware, most significant clue to anything being done with Devil Survivor at the current moment.
Gin in DeSu 2 the Animation - I once saw an off-hand mention that Gin from the first game appears as a background cameo in the anime of DeSu 2. I don't want to rewatch it and carefully look for him, so help if this is in fact real would be greatly appreciated
The real DeSu 3 is the Devils we Survived along the way - I once had a dream that I was somewhere in Africa, on holidays with my mom. A kid walked up to me and asked me to play with him with a ball so I did for a while, before I suddenly see him run away from me to Naoya from Devil Survivor. Curious, I went on the internet and found out that this was apparently his voice actor (which looks just like Naoya for some reason) and that he's involved in controversial activities including making concentration camps.
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