History Retcon / AnimeAndManga

** ''Anime/MobileSuitZetaGundam'' contains scenes where the titular Gundam does things such as turning its [[LaserBlade beam saber]] into a [[{{BFS}} mile-long "sword of rage"]] and channeling the spirits of the dead to power itself up. Originally this was just attributed to pilot Kamille Bidan's incredible [[PsychicPowers Newtype powers]], but later works introduced the concept of the Biosensor, an experimental system in the Zeta which boosts a Newtype's abilities, and serves to allow these fantastic feats without completely destroying the RealRobot feel of the show.

* ''Manga/MahouSenseiNegima'':

** [[spoiler:Even Goku's ''age'' is retconned; ironically, retconned back to what it originally was stated to be by Goku early on. As of Dragon Ball Minus, Goku was sent to Earth when he was three. Bulma was 5 at the time. This would make him 14 during the beginning of Dragon Ball; exactly the age he said he was when Bulma asked, despite it later being changed to 12 after Goku 'learned' to count. Of course, with Goku being Goku, he may have just counted wrong.]]

** Battle of Gods and Revial of "F" treat Goku and Vegeta as having grown far stronger in their base forms and super saiyan forms thanks to their godly power. By the time of the Tournement of Power, their base power is once again below that of Buu and Ultimate Gohan, based on their battles with the Trio de Dangers.

** And of course, the biggest retcon of all. Goku is in fact an alien from a destroyed planet, which was never intended in the original ''Manga/Dragonball''.

** And of course, the biggest retcon of all. Goku is in fact an alien from a destroyed planet, which was never intended in the original ''Anime/Dragonball''.

** In the Cell Saga Future Trunks mentions Yajarobe was one of the many people killed by Android 17 and 18 in his timeline, and he is shown being killed in the flashback by 18 after she breaks his sword, however in the Goku Black Saga, Yajarobe is one of the few people from the present who is still alive in Future Trunks' timeline.

** The posted "birth date" of the title character changed from the fairly vague "Summer 1993" to the even more vague "1994" between the magazine version of Chapter 10 and the publication of Volume 2. This works as a {{Revision}}, as it renders Negi's in-story usage of a [[http://en.wikipedia.org/wiki/East_Asian_age_reckoning historical Japanese method of age reckoning]] correct, but also makes determining his actual age more difficult.

* In ''Manga/{{Eyeshield 21}}'', Agon's hair is a walking retcon. In one flashback to his 10th grade year he had short blonde hair and in another he had incredibly long dreads. In middle school, depending on whose reminiscing, Agon either had short thick dreads, long thick dreads, short thin dreads, or shoulder-length blonde hair.

* ''Anime/DragonBallSuper''
** Apparently, Future Trunks hair color. It goes from being purple to blue. [[spoiler:Episode 52 includes moments from ''[[Anime/DragonBallZTheHistoryOfTrunks The History of Trunks]]'', which also show this change.]] What makes this odd is the fact that the present-day Trunks still has purple hair. [[AdaptationInducedPlotHole In turn, this is based on a problem with the anime adaptations]] as Trunks always had the same hair color as Bulma in the manga.

** Apparently, Future Trunks hair color. It goes from being purple to blue. [[spoiler: Episode 52 includes moments from History of Trunks, which also show this change.]] What makes this odd is the fact that the present day Trunks still has purple hair. [[AdaptationInducedPlotHole In turn, this is based on a problem with the anime adaptations]] as Trunks always had the same hair color as Bulma in the manga.
** The "permanent" nature of the [[FusionDance Potara earrings]] turns out to have been a miscommunication; they're only truly permanent if a Kai is involved, and otherwise wear off after one hour. Since the previous explanation for Vegito's defusion was speculated to be AWizardDidIt combined with YourMagicIsNoGoodHere, [[Administrivia/TropesAreTools this is generally regarded as an improvement]], especially since [[{{Revision}} it doesn't outright contradict the previous events]].

* This is combined with EarlyInstallmentWeirdness in ''Anime/FullmetalAlchemist''. In their backstory episode, Edward and Alphonse are sparring when Ed kicks his brother into the water. A much later episode shows that both had previously thought that getting Al's seal wet would kill him, and are surprised when it doesn't.

* ''LightNovel/ACertainMagicalIndex'': The ''Miracle of Endymion'' film revolves around Academy City's space elevator, a giant tower sprouting out of the middle of the city. It definitely wasn't there before. In ''Manga/ACertainScientificRailgun'', Uiharu [[LampshadeHanging very pointedly]] tells Saten that the tower just happened to be outside the panel in every single previous shot of the city skyline, and gives a few brief flashbacks of previous arcs from new angles, with the tower obvious in the background.

* ''Manga/JacoTheGalacticPatrolman'' [[spoiler: retcons quite a lot about the Dragon Ball series]].
** [[spoiler: The entirety of the [[Anime/DragonballZBardockTheFatherOfGoku Bardock Father Of Goku]] special was retconned. In that movie, Bardock was shown as a man with the ability to see the future who made a futile, last stand against Freeza after forseeing the death of his planet, only to die against Freeza with his last thoughts being of his youngest son. Even his relationship with his comrades is explored; one of the driving aspects of Bardock is to avenge the death of his best friend. ''Dragon Ball Minus'', part of the Jaco manga, takes the ''opposite'' approach. Bardock's comrades are entirely removed, landing them as filler only entities, and instead, Bardock's relationship with his children and wife is focused on a little more. Contrast with Bardock's rather cold nature in the original movie, he's shown to have an actual loving relationship with his wife, and actually sends Kakarot away out of concern for his safety when Freeza called all the Saiyans back to Vegeta. He even asks on Raditz, who he entirely glossed over in the movie. Additionally, Freeza knew of the Super Saiyan God, information he was never stated to know in the original canon.]]
** [[spoiler: Even Goku's ''age'' is retconned; ironically, retconned back to what it originally was stated to be by Goku early on. As of Dragon Ball Minus, Goku was sent to Earth when he was three. Bulma was 5 at the time. This would make him 14 during the beginning of Dragon Ball; exactly the age he said he was when Bulma asked, despite it later being changed to 12 after Goku 'learned' to count. Of course, with Goku being Goku, he may have just counted wrong.]]

** Raditz also mentions that the saiyans are the strongest warrior race in the universe and run the planet trade racket. Come the next arc, Freeza's unnamed race (or at least his family) is widely known as the strongest clan in the universe, and they run the planet trade instead.
** In the Saiyan arc, Vegeta is his own boss and heads off to Earth without a second thought on a whim immediately after hearing about the dragon balls. In the Freeza arc, it's retconned so that he was a minion of Freeza, and him going to Earth was a rebellious act (which weirdly was not mentioned by either of his subordinates).

* ''Anime/TheMysteriousCitiesOfGold'':The Golden Condor's design changes between the first and the second season. Its landing gears are completely different, exhaust ports are visible in the tail, and it now has a ladder hidden in its beak that the children "discovered" during the TimeSkip.

* ''LightNovel/ACertainMagicalIndex'': The ''Miracle of Endymion'' film revolves around Academy City's space elevator, a giant tower sprouting out of the middle of the city. It definitely wasn't there before. In ''Manga/ACertainScientificRailgun'', Uiharu very pointedly tells Saten that the tower just happened to be outside the panel in every single previous shot of the city skyline, and gives a few brief flashbacks of previous arcs from new angles, with the tower obvious in the background.

* The first episode of ''Anime/KillLaKill'' has the BigBad Satsuki obviously kill a student, something that we later see is out-of-character for her. A future character shows the boy alive.

** The "permanent" nature of the [[FusionDance Potara earrings]] turns out to have been a miscommunication; they're only truly permanent if a Kai is involved, and otherwise wear off after one hour. Since the previous explanation for Vegito's defusion was speculated to be AWizardDidIt combined with YourMagicIsNoGoodHere, [[TropesAreTools this is generally regarded as an improvement]], especially since [[{{Revision}} it doesn't outright contradict the previous events]].

*** The HD Remaster of ''SEED'' alters the circumstances of [[spoiler:Nicol Amalfi]]'s death, changing it from an intentional but tragic act of violence[[note]]Nicol charged Kira Yamato's Strike Gundam and Kira, reacting without thinking, cuts the Blitz Gundam in half[[/note]] into a stupid accident[[note]]The Blitz Gundam trips and falls onto the Strike's sword[[/note]]. Fans were up in arms over this one because Kira is often viewed as a CreatorsPet and retconning the death was seen as a ham-fisted attempt to [[TheDogShotFirst absolve him of the murder]].

** Apparently, Future Trunks hair color. It goes from being purple to blue. [[spoiler: Episode 52 includes moments from History of Trunks, which also show this change.]] What makes this odd is the fact that the present day Trunks still has purple hair.

** Meowth was originally the sole bipedal Meowth. Since Hoenn, several other bipedal Meowth have appeared without question. The only thing weird about Meowth now is that he can talk.

** Some elements of the DistantFinale, Chapter 700, were later retconned. The [[EarlyInstallmentCharacterDesignDifference character designs are off]] in Chapter 700 compared to how they'd later be in the ''Manga/{{Boruto}}'' manga and anime. Everyone looks younger and their clothes are different (for example Sarada wears a casual-looking sweater, tie, and skirt instead of her red ninja-looking outfit in ''Boruto''). Sarada and Sakura's dialogue involving Sasuke imply that he's present in Sarada's life, [[WhenYouComingHomeDad if busy and often away on missions]]. ''Manga/NarutoGaiden'' changes this so that, due to a mission, Sasuke hasn't seen Sarada since she was a toddler. The chapter also includes [[CharacterizationMarchesOn character differences]], such as Chocho being FatAndProud instead of interested in dieting. In Chapter 700, Hinata is shown with long hair during Boruto's academy days but in ''Boruto'', Hinata has short hair even at the start.

** Another dub-induced one. In the episode introducing Brock, it was said that his mother passed away in the dub (which wasn't the case otherwise). Later on, come Pokémon Chronicles, Brock's mom returned to the Pewter City Gym and the dub treated things as if they never said she had died.

** When Lyra appeared in Sinnoh, Brock and Ash acted like they experienced Pokeathelons when they didn't.

** Nirvana, a giant walking weapon, was initially drawns with 8 legs but suddenly had 6 when the method by which it had to be destroyed was determined. The characters explain this via ShrugOfGod in the Q&A section afterward.

** Gaara's name was stated to mean 'Demon who loves only himself' by his mother, a dying curse on the village for sacrificing her. Skip ahead to the war arc and suddenly she loved him all along. Also, everyone in his family loved him, even the one who tried to murder him.
** The Sage of the Six Paths is stated to be the first to utilize chakra and also the one who solely defeated the Ten-Tailed Beast. Along comes Hamura in Chapter 670.