All of my short summary post for Shingeki no Kyojin did not include the undisclosed information part, so this thread is use for that, and for that only.
For discussion head over here: https://shunkashuutou89.wixsite.com/theworldofjculture/forum/anime/discussion-shingeki-no-kyoji-anime
Update: Added the first two episode of season 1 as I want to explain first before I post the remainder episodes of season 1, I will post the OVA episodes at the end of Season 3 and I will be naming it as OVA Episode instead of its really episode number as most of the episodes took place in between episodes and some took place before the series hence I will name the OVA Episode as the release dates instead and I will state what episode it took place.
Update 2: Did some alignment to make the post look a little neater then before, I will be posting all the trivia as soon as I need some time to do this and I hadn't finish copying the information from the site I got this information from. I also forgot to mention that the picture is the original text as seen on the television airing, I had added it in so that for people who did not pause it for did not have the time to go back to re-watch easier to understand what was in the picture.
Update 3: Another update today, there are a few missing episode that did not had the 'Currently Publicly Available Information' from the site I got the information from. I remember seeing it in this episodes but the site did not seen to have it. Maybe it was just me as I can't recall if the episode has it or not, but am pretty sure that I saw it. So, I will leave it as it is with missing information as stated just in case I was right as I may go check it out later.
Update 4: With this least update, all of the trivia or 'Currently Publicly Available Information' in this case is up or at least for now as Part 2 of Season 3 airs end of this month, I will update this thread as it airs but biweekly maybe as I had not make my decision for now.
Update 5: All of Season 3 Part 2 Trivia is up. The final Season has been announce and it will be out Q4 of next year according to the PV that was shown at the of Season 3 Part 2.
Episode 59 - Beyond the Walls
Currently Publicly Available Information
Intent for the Future
It is evident that the world perceives us as a 'race of devils.' The people of our world wish to eradicate us 'Subjects of Ymir.' However, we must not simply wait for our extermination to come about. As long as we live, we must strive to ensure our survival and our efforts to prevail must never cease. However, is a display of power enough to frighten the world our only method of doing so? Is there no other option than flaunting the very power we possess, the Power of the Titans, that makes the world believe we are devils? Is it delusional to think we could all sit around the same table and talk? I want to think it possible, even if it seems an idealistic view. I believe coming up with a better way is my duty, and so I must never turn away from thinking about it.
Episode 58 - Attack Titan
Currently Publicly Available Information
The Nine Titans
The true identity of Intelligent Titans stemming from a power exceeding human comprehension that sleeps in Subjects of Ymir. Said power is inherited along with memories through paths which transcend space and time. The 'Coordinate' where all paths intersect is the Founding Titan.
Episode 57 - That Day
Currently Publicly Available Information
Humanity Outside the Walls
Though the humans who live outside the walls look no different from us and speak the same language as we do, their civilization appears far more advanced than ours. However, they view us who live inside the walls as a race of devils that have committed terrible sins.
Episode 56 - The Basement
Currently Publicly Available Information
Basement Key
Grisha Jaeger, having come from outside the walls and thus knowing many secrets, entrusted the basement key to his son. The basement will likely reveal the mysteries of the world which Grisha couldn't mention to anyone.
Episode 55 - Midnight Sun
Currently Publicly Available Information
Injection Conditions
Not only can Titan powers and much-needed information be stolen by using the injection, but it also allows the revival of someone who is critically wounded. The ideal candidate would be someone near death that is already close to an incapacitated enemy with Titan powers.
Episode 54 - Hero
Currently Publicly Available Information
The Outside World
It's said a world beyond our wildest dreams extends outside the Walls. It has fiery waters, lands of ice, sandy snowfields, and a saltwater lake called the sea that stretches far past the horizon. Some have joined the Scout Regiment to fight solely because seeing it is their dream.
Episode 53 - Perfect Game
Currently Publicly Available Information
The Colossal Titan's Steam
A Titan's special powers are produced by using its own body as a resource. In that way, it is thought the steam emitted by the Colossal Titan consumes muscle tissue and therefore must be finite.
Episode 52 - Descent
Currently Publicly Available Information
Dark Liquid
Believed to be a beverage consumed by the Titan shifters while they were camping out. Confirmed to have a pleasant aroma from the remaining liquid found. Its origin is unknown, but this suggests the existence of an 'outside' culture that consumes luxury goods similar to black tea.
Episode 51 - Thunder Spears
Currently Publicly Available Information
Thunder Spears
A weapon developed to combat the stout defense of the Armored Titan using technology formerly kept secret by the Interior Police. Though challenging to wield, it can deliver a concentrated blow comparable to a strike of lightning.
Episode 50 - The Town Where Everything Began
Currently Publicly Available Information
Glowing Ore
Ore harvested from the Reiss family's underground cavern. Thought to be produced by some sort of Titan power. It emits more light than a torch, and with appropriate manufacturing, can greatly extend nighttime operations.
Episode 8 - Lost in the Cruel World
Currently Publicly Available Information
Ferry Boat
Connects humanity's active districts.
Moves via chains elevated over rivers.
Transports passengers, freight, military supplies, and other materials.
In year 845, when Shiganshina District was attacked, many residents utilized these ferry boats in order to reach Trost District for refuge.
Maximum capacity is 150 tons.
Its power source is identical to that of the ODM gear - utilizing pressurized air.
This took place at a unknown timeline of the series as it seem to be dream or what if story.
Episode 7 - Wall Sina, Goodbye: Part Two
Currently Publicly Available Information
Waste Liquid Tank
A large tank that stores dirty water and waste liquid containing toxic pollutants generated from industrial activities. It has a capacity of 5000m.
When the dirty water and waste liquid exceeds a set level, part of its content will be transferred to another tank and purified through a special filtration device to make it harmless to the human body before being discharged from the plant.
This took place before episode 17 began as listed by the episode count as 16.5B.
Episode 6 - Wall Sina, Goodbye: Part One
Currently Publicly Available Information
Stohess District
A walled city located to the east of Wall Sina. While there are high-class residential districts where the rich live, there are also places like bars in its backstreets where laborers gather, creating a dangerous atmosphere.
In the past, there were plans to build an Underground City, but they were abandoned for some reason. Even now, the remnants of its tunnels are still around.
This took place before episode 17 began as listed by the episode count as 16.5A.
Episode 5 - No Regrets: Part 2
Currently Publicly Available Information
Scouting Missions
Exploratory activities carried out by the Scout Regiment beyond the Walls. Their goal is to both explore the unknown area outside the Walls as well as to determine the true nature of the Titans.
However, many soldiers are lost during each scouting mission, including thirty percent of new recruits during their first scouting mission.
This took place before the series began as listed by the episode count as 0.5B.
Episode 4 - No Regrets: Part 1
Currently Publicly Available Information
The Underground City
Created as a result of a previous plan to move underground in order to escape the Titans.
However, the plan was aborted, and it has since become a slum of sorts, where paupers, criminals, and more live.
As there are very few opportunities for its residents to be exposed to sunlight, many inhabitants develop issues with their legs.
This took place before the series began as listed by the episode count as 0.5A.
Episode 3 - Distress
Currently Publicly Available Information
The Wasteland Navigation Exercise
A field exercise in which the cadets are split into two detachments and make a round trip through a wasteland. Both groups depart at the same hour and travel along two different routes, retrieve the planted object, then return to base. The target of this exercise is to find out how well one can stay alert in a non-critical situation.
This took place before place episode 4 as listed by the episode count as 3.75.
Episode 2 - The Sudden Visitor: The Torturous Curse of Youth
Currently Publicly Available Information
None Listed. I will add in when the site that I got this information updates it may take a long time for it to happen or it may not happen.
This took place before place episode 4 as listed by the episode count as 3.25.
OVA
Episode 1 - Ilse's Notebook: Memoirs of a Recon Corps Member
Currently Publicly Available Information
Titan Biology
Little remains in recorded history about the causes behind the Titans' appearance, making the subject a near-total mystery.
The Titans act for one reason: to eat humans. However, the data suggests that they do this not to feed, but to slaughter.
This took place before place episode 4 as listed by the episode count as 3.5.
Episode 49 - Night of the Battle to Retake the Wall
Currently Publicly Available Information
Meat
After the fall of Wall Maria, there was a dramatic decrease in food production. Livestock in particular suffered due to requiring plentiful land. As a result, meat became expensive and occasions to eat it are scarce.
Episode 48 - Bystander
Currently Publicly Available Information
Executioner from Hell
A semi-automatic Titan extermination weapon constructed in part by Eren Jaeger's hardening ability and the wall. It can safely fell and eliminate Titans compared to previous methods.