History Retcon / AnimeAndManga

* The ''Anime/MajinTanteiNougamiNeuro'' anime [[spoiler:retcons almost all the random culprits from earlier in the manga into guinea pigs of HAL and the electronic drug. This is most likely because the anime ended before the last arc involving the New Bloodline could be animated and as such, HAL is the last arc antagonist faced by Neuro and co.]]

* ''Anime/ACertainMagicalIndexMiracleOfEndymion'' 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.

** Multiple flashbacks and instances of Ash reminiscing about his battle with Alain leave out Ash-Greninja, to the point that a scene of his battle with Mega Charizard in Journeys was redrawn to make base Greninja confront Charizard instead. His battle with Mega Gardevoir during Ash's rematch against Diantha is also implicitly left out when Ash mentions that he fought her only once instead of twice.

** In the [[http://forums.animesuki.com/showthread.php?p=2593929#post2593929 third Megami sound stage]], Hayate says that Fate is more of a sister to Vivio, and Nanoha says that while Fate loves Vivio, she is keeping some distance from her. In ''[=ViVid=]'', Vivio says she [[HasTwoMommies still considers both of them her mothers]], and Fate once refers to herself in the third person as "Fate-mama" while talking to Vivio.

* ''Manga/NegimaMagisterNegiMagi'':
** In the last page of chapter 238, Makie shows up with her friends in kid form, looking smaller than Negi. In the first page of the next chapter, in the very same scene, she is now in teenage form and {{Marshmallow|Hell}}s Negi.
** 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 [[https://en.wikipedia.org/wiki/East_Asian_age_reckoning historical Japanese method of age reckoning]] correct, but also makes determining his actual age more difficult.
* Somewhere between volume 5 and 11 of the English-language ''Manga/GreatTeacherOnizuka'' manga, the average age of the protagonist's class gets bumped from 14 to 16.
* The ''Franchise/{{Gundam}}'' canon has a pretty significant number of these.
** Gundam Alex from ''Anime/MobileSuitGundam0080WarInThePocket'' was originally the fourth Gundam made by the Federation during the One Year War. However, M-MSV, a design series released shortly after ''0080'', introduced a Gundam called Gundam Unit 4. The Master Grade Gundam Alex manual tried to reconcile the differences by saying there may be multiple Unit 4s due to parallel development... Then later sources just ignored the fact that Alex is Unit 4 altogether.
** The biggest retcon introduced by ''Anime/MobileSuitGundamThe08thMSTeam'' was giving the Federation mass produced mobile suits before the attack on Jaburo, but it also introduced the GM Early Type, an early production type GM... that for some reason, looks exactly like the GM Type C from ''Anime/MobileSuitGundam0083StardustMemory'', a ''late production'' type GM. The Master Grade GM Type C manual retconned the former into a prototype of the latter, but the GM Early Type remained such a confusing addition that it was left untouched by virtually ''all'' expanded universe material afterwards. Even reference books tend to be pretty vague on its place in the GM development line.
** Speaking of GM Type C, early sources just couldn't agree whether it was produced after the One Year War or near the end of the war. This came to an end when Anime/MobileSuitGundamMSIGLOO established that a massive number of them took place in the Battle of A Baoa Qu (the final battle of the war).
** It's a common practice in Gundam media to retcon later established mobile suits into battles shown in older works. IGLOO 2 had GM Ground Type fighting at Odessa, Battlefield Record U.C. 0081 had GM Command Space Type at A Baoa Qu, etc.
** ''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 channelling 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.
** ''Zeta'' introduced another, somewhat unusual example. At the start of the show, the Next Big Thing in mobile suit tech is the Movable Frame, a skeleton-like framework that allowed for greater flexibility and freedom of movement, which in turn allowed the creation of TransformingMecha down the line. In order to justify this, it was said that all previous generations of MS were empty "shells" with their armor supporting the weight of all their internal machinery. While this concept [[TruthInTelevision does exist in real life]] (it's called [[https://en.wikipedia.org/wiki/Monocoque Monocoque]]), the writers eventually realized that [[ArtisticLicensePhysics it doesn't make a lick of sense for giant robots]], and over time this explanation has been mentioned less and less.
** The resolution of the series itself in the final CompilationMovie, which not only changed the ending from a DownerEnding into a BittersweetEnding, but also potentially alters the course of two related sequels drastically (if not does away with them entirely). Creator/YoshiyukiTomino, who created ''Franchise/{{Gundam}}'' and directed the ''Zeta'' movies in specific, has said that he considers the movies an AlternateTimeline, but many fans like to believe that the movies shift the less-popular ''[[Anime/MobileSuitGundamZZ Gundam ZZ]]'' into CanonDisContinuity territory. Tomino then went on to write the CG short ''Gundam Evolve 5'', which depicts a battle from ''Anime/MobileSuitGundamCharsCounterattack'' with a more positive outcome; Tomino has said he considers the short to be the "New Translation" version of ''CCA''.
** Another rather famous example is ''[[Anime/MobileSuitGundamWing Gundam Wing]]: [[TheMovie Endless Waltz]]'', which quietly replaces the TV series' Gundams (designed by ''Franchise/{{Gundam}}'' veteran Kunio Okawara) with sleeker designs by Hajime Katoki via a FlashBack prologue. Fandom is split on the issue, and there's quite a bit of [[BrokenBase feuding over which designs are superior]], despite the fact that they're supposed to be functionally identical. The manga ''Glory of the Losers'' (a retelling of ''Wing'') retcons things further by showing that Wing Zero started off in its TV form (which was dubbed "Proto-Zero") and was later modified into the ''Endless Waltz'' version, with the angelic wings originating as an upgrade to Zechs Merquise's Tallgeese.
** ''[[Anime/MobileSuitGundamSEED Gundam SEED]]'' has a couple of infamous examples:
*** ''SEED Special Edition'', a CompilationMovie, retcons the death of [[spoiler:Mu la Flaga]] by digitally erasing a sure sign of the character's death ([[spoiler:his broken helmet floating by the wrecked Strike Gundam]]). Fans were none too happy about the writers retconning a meaningful character death just so said character could come back in ''[[Anime/MobileSuitGundamSEEDDestiny SEED Destiny]]''.
*** 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 [[AdaptationalSelfDefense absolve him of the murder]].
* One episode of ''Anime/DigimonAdventure02'' has a flashback of the [[Anime/DigimonAdventure season one]] characters giving up their ability to evolve past a certain level (and by extension, their ability to be of any use in a fight). This comes up right in the middle of the season, soon after the AppliedPhlebotinum the now-reformed Ken was using to obstruct their evolution is destroyed, and basically comes across as a cheap excuse to keep the old characters out of the CompetenceZone. It also gave Patamon and Gatomon (two heroes from 01 that made the main cast in 02) a reason to DNA digivolve.
* ''Manga/HayateTheCombatButler'': For those who haven't read the manga, this ''seems'' to happen between the first and second seasons of the anime. In the last episode of the first season Ayumu and Hinagiku are shown to know each other (well enough for them to travel to the Parthenon together), but in the second season, they acted as if they'd never met. In the same episode, it's stated that Hayate's been Nagi's butler for over a year, whereas in the first episode of season 2, Klaus says Hayate's only been Nagi's butler for a month. \\
\\
However, this is easily explained by the fact that the events of the last episode of the first season of the anime (Ayumu and Hina's parthenon trip and Hayate and Nagi's trip to the Aegean sea) were, in the original manga, side-stories that took place during the golden week holidays and that were out of sync with the rest of the series' continuity.

* ''Franchise/LyricalNanoha'':
** In the [[http://forums.animesuki.com/showthread.php?p=2593929#post2593929 third Megami sound stage]], Hayate says that Fate is more of a sister to Vivio, and Nanoha says that while Fate loves Vivio, she is keeping some distance from her. In ''[=ViVid=]'', Vivio says she [[HasTwoMommies still considers both of them her mothers]], and Fate once refers to herself in the third person as "Fate-mama" while talking to Vivio.
* ''Manga/{{Naruto}}'':
** In earlier manga chapters, Gaara had triple-pierced ears despite his automatic sand shield, which almost always prevents him from taking physical damage.
** Gaara's name was stated to mean 'Demon who loves only himself' by his mother, a dying curse on the village for sacrificing her, and he was told this by the uncle who despite showing him kindness claimed to always hate him deep down for her death. Skip ahead to the war arc and his resurrected father reveals she loved Gaara all along, and that he told his uncle to lie about it (as well as force him into the assassination) as a test of character to see if Gaara could control Shukaku when confronted with such a horrible claim, [[UnstoppableRage which he didn't, obviously]].
** 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, his previously-unheard of brother who is also the source of the Hyuga clan's Byakugan.
** ''Manga/{{Boruto}}'' has retconned some stuff about the Byakugan. According to it, not ''all'' Hyuga unlock the Byakugan and the Byakugan requires training to unlock. This makes it more similar to the Sharingan; however, none of this was depicted in the original ''Naruto''.
** 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 from ''Boruto''). Sarada and Sakura's dialogue imply that Sasuke'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.
* The ''Anime/SpaceBattleshipYamato'' movie was meant to end the story, so [[spoiler:the ending has many core crew members, including Kodai and Yuki, dead with the Yamato destroyed in a suicide charge]]. After fan outcry, the movie was adapted into the second season TV series with a different ending [[spoiler:so that the ship is not destroyed and most crew members live.]] Several movies and a third TV season later, the second movie is just claimed never to have happened.

* Early on in ''Manga/SoulEater'', Liz Thompson briefly remembers her and Patty's {{Backstory}}, saying that her life took a turn for the bizarre on that day that she got high and tried to mug a {{Shinigami}} (Kid). A couple dozen chapters later, it's instead revealed that Kid came to New York specifically to recruit the Thompson sisters as his weapons, no mugging involved. They went along for the ride, at least initially, to milk him for all the money and convenience he could provide them, before [[BecomingTheMask coming to admire him for real]]. The two events could have both happened though, since the later chapter didn't specifically deny the mugging. What could have happened is that he came looking for Liz and Patty, they tried to mug him but Kid got away, and he came back to them at later chance to recruit them.
* ''Anime/YuGiOh5Ds'':
** In the original Japanese version, we see that the five bearers of the Mark of the Dragon are Yusei (tail), Jack (wings), Luca (claw), and Aki (other claw). This is true for the English version too, with the fifth signer being unknown in both versions. Then, the English version mentioned that Rex Goodwin bears the final mark, before Japan even knew it. Because it was false information. Japan later aired their episode to show that Rudger has the head of the dragon. After this, the English version just pretended that they never said Goodwin had it.
** When the Signers first realize that their marks look like the Crimson Dragon, Yusei incorrectly states (in the English version) that his is the head, not the tail. And it became even more confusing when Rudger and Goodman were defeated, with Yusei actually gaining the real head, and transferring his tail mark to Crow. This was barely even addressed in the English version, despite the fact that it's tattooed onto their freaking arms.

* ''Manga/JacoTheGalacticPatrolman'' [[spoiler:retcons quite a lot about the ''Franchise/DragonBall'' series]].
** [[spoiler:The entirety of the ''[[Anime/DragonballZBardockTheFatherOfGoku Bardock: The 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: Another small retcon? In the manga, Bulma was stated to be on 'summer vacation' when she was hunting for the Dragon Balls, but as of the Jaco manga, she was stated to have graduated University at age 16. The details are just plain muddled now.]]
** [[spoiler: Goku originally came to Earth as a baby, but ''Dragon Ball Minus'' states he was three years old by the time Bardock and Gine sent him to Earth.]]
** [[spoiler: In addition, Goku's new age even [[InvertedTrope retcons a previous retcon]]. In the Pilaf Saga, his age is stated to be 14 after the 16-year-old Bulma asks what his age is. The TournamentArc the following year reveals that he's 12 (11 back then) and that he only thought he was 14 because he was bad (or in [[IdiotHero Goku's]] case, worse) with numbers; this initially makes him younger than the 13-year-old Krillin. Now that he's 3 by the time he touches down on Earth, since we also see a 5-year-old Bulma during ''Jaco's'' time period, this ''actually'' makes Goku 14 by the time ''Dragon Ball'' starts. This in turn makes him significantly ''older'' than Krillin, as well as only slightly younger than Yamcha or Tenshinhan, despite still being around Krillin's height until after his training with Kami.]]
* ''Franchise/DragonBall'':
** The Saiyan arc of ''Anime/DragonBallZ'' gets severely retconned by the Freeza arc, to the point that the entire plot is basically erased.
** At the very beginning of the arc, Raditz mentions that planet Vegeta, the Saiyans' original homeworld, was destroyed by a meteor. The next arc 'reveals' that it was actually destroyed by Freeza, who then told everyone that a meteor did it.
** 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).
** While often forgotten today, it was actually Vegeta who was first introduced as the strongest in the universe (he outright calls himself this in his internal monologue, so no room for lying or an UnreliableNarrator). This was explained by him being the top dog in a race said to be the universe's greatest warriors. Come the Freeza arc, suddenly Vegeta admits that he's weaker than Dodoria and Zarbon, and their boss Freeza is a guy who's literally thousands of times stronger than that, because... he... just kinda is.
** In the Saiyan arc, Vegeta states that he wants to get the dragon balls to wish for immortality so he can enjoy a lifetime of violence forever. Nappa agrees with him. In the Freeza arc, he wants immortality to defeat Freeza.
** Nappa states in the middle of the arc that Vegeta's name came from ''the planet itself''; he was a Saiyan noble named after the Saiyans' homeworld because he was the strongest and cruelest of them and thus the greatest representative of their race. In the Freeza arc, Vegeta is said to be a prince named after his dad, the king, who gave his name to the planet.
** It was stated by Creator/AkiraToriyama through a [[https://i.imgur.com/5sf9Osb.jpg 30th anniversary celebration manga]] that all of this came about due to Vegeta's unexpected popularity; he had intended for Vegeta to be killed by Goku, but his popularity led him to spare Vegeta and create Frieza to take over Vegeta's role and be killed off in his place.
** 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''.
** Apparently, Future Trunks' hair color in ''Anime/DragonBallSuper''. 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.
** 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]].
** When introduced in ''Dragon Ball'', Master Roshi claimed that the Immortal Phoenix granted him eternal life, and later died after he fed it tainted bird seeds. However, in episode 76 of ''Super'', Roshi says the Paradise Herb in the Forest of Terror will let him live another 1,000 years, implying this is how he has stayed alive for over 300 years.
** In the Cell Saga, Future Trunks mentions Yajirobe 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, Yajirobe is one of the few people from the present who is still alive in Future Trunks' timeline.
** 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 Tournements, their base power is once again below that of Buu, Piccolo and Ultimate Gohan, based on their battles with Frost and Trio de Dangers.
* 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 episode shows the boy alive.
* In ''Manga/WanderingSon'', when CoolBigSis Yuki met Takatsuki it was heavily implied she was drawn to him because she knew he was biologically female and nervous about being out as a boy for the first time. Despite this several chapters later she seems genuinely surprised when he [[UnsettlingGenderReveal reveals his sex]], though she could have been surprised at Nitori coming out.
* This is combined with EarlyInstallmentWeirdness in ''Anime/FullmetalAlchemist2003''. 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 blood seal wet would kill him, and are surprised when it doesn't.
* ''Manga/SgtFrog'': A fairly inoffensive one though. The official databook for the manga released alongside volume 23 changed the ages of several characters compared to their initial ones in previous databooks. Natsumi and Koyuki are 14 years old in the present, but now were 13 in the beginning of the series and Mutsumi now is said to be 16 years old (which would make him 15 in the beginning of the series), rather than 18 like in the previous official publications. In general, the new official ages seem to match up with the ones used by the original anime, although Mutsumi still is one year older than his anime self.
* ''Anime/ACertainMagicalIndexMiracleOfEndymion'' 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.
* ''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.
* The ''Anime/MajinTanteiNougamiNeuro'' anime [[spoiler:retcons almost all the random culprits from earlier in the manga into guinea pigs of HAL and the electronic drug. This is most likely because the anime ended before the last arc involving the New Bloodline could be animated and as such, HAL is the last arc antagonist faced by Neuro and co.]]
* ''Manga/BloodBlockadeBattlefront'': In the original one-shot manga, Klaus von Reinherz was a [[OurVampiresAreDifferent vampire]] who managed to have his transformation locked before he fully turned into a Blood Breed. By doing this, he managed to gain powers, but keep his human conscience. This backstory ended up getting scrapped, but Klaus still kept his fangs as a part of his character design.
* A minor one occurs in the anime version of ''Manga/MagicKnightRayearth''. The episode where [[spoiler:Presea dies]] ends with the three girls looking on sadly--including Fuu, who has a healing spell but doesn't use it to try and save their friend. The next episode has them discussing the event, and state that Fuu ''did'' try Healing Wind, but that it didn't work (evidently realizing the oversight).

** ''Journeys'' enjoys putting these:
*** When Erika first appeared in the anime, she had a look that was different from that in the games, having blue hair and wearing a green dress. When Erika reappeared in the opening for ''Anime/PokemonIChooseYou'' and later ''Anime/PokemonJourneys'', without explanation, her look is now like that in the games, with her having black hair and wearing a kimono.
*** The most egregious example is Ash-Greninja getting forgotten. When explaining his bond with Greninja, Ash very vaguely explains to Goh that he and Greninja can achieve a special bond. Although this is just a way to leave it vague, it doesn't help that a shown flashback of Ash battling Alain and his Mega Charizard X was ''literally'' redone in ''Journeys'' art style so that Greninja never used his Ash-Greninja form when it did. And even during their reunion, Ash never once bothers to summon the Ash-Greninja form, and the story retcons that to the two of them having a bond through Aura as an excuse to train Ash's Lucario better. (YMMV if the writers tried to create an Ash-Lucario but were denied this time.)
*** Later on, when Ash meets up with Diantha, he states that they only fought once, when in fact, they fought twice. Needless to say, fans were ticked off that the "once" probably meant his fight using Pikachu instead of the fight with Ash-Greninja to further retcon the form from existence.
*** This is also reflected in ''VideoGame/PokemonScarletAndViolet'', where Ash-Greninja has been removed and Battle Bond now just boosts Greninja’s stats.

** In ''Anime/PokemonTheFirstMovie'', we learn about Mewtwo and how it was created by Team Rocket in addition to being the only one of its kind. However, in ''Anime/PokemonGenesectAndTheLegendAwakened'', we learn of a different Mewtwo that was created by another group of people, contradicting that the first one was the only one of its kind. This conundrum was actually the result of ScrewedByTheLawyers from Creator/TakeshiShudo's estate that prevented that first Mewtwo from being used in that movie.

*** This is also reflected in Pokémon Scarlet and Violet where Ash-Greninja was removed and Battle Bond now just boost Greninja’s stats.

* ''Anime/DragonBallZ'': The Saiyan arc gets severely retconned by the Freeza arc, to the point that the entire plot is basically erased.

* ''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.

** It was stated by Toriyama through a [[https://i.imgur.com/5sf9Osb.jpg 30th anniversary celebration manga]] that all of this came about due to Vegeta's unexpected popularity; he had intended for Vegeta to be killed by Goku, but his popularity led him to spare Vegeta and create Frieza to take over Vegeta's role and be killed off in his place.

** In the Cell Saga Future Trunks mentions Yajirobe 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, Yajirobe is one of the few people from the present who is still alive in Future Trunks' timeline.

* 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 blood seal wet would kill him, and are surprised when it doesn't.

** This one's [[DubInducedPlotHole dub only]]. When Ash returned to Viridian City for his eighth Kanto Badge, Ash said in the dub that it had been a year since he was last there. Later, in the short accompanying the third Pokémon movie, Ash and co. celebrate the (presumably first) anniversary of Ash and Pikachu meeting.

** When Erika first appeared in the anime, she had a look that was different from that in the games, having blue hair and wearing a green dress. When Erika reappeared in the opening for ''Anime/PokemonIChooseYou'' and later ''Anime/PokemonJourneys'', without explanation, her look is now like that in the games, with her having black hair and wearing a kimono.

** When Erika first appeared in the anime, she had a look that was different from that in the games, having blue hair and wearing a green dress. When Erika reappeared in the opening for ''Anime/PokemonIChooseYou'' and later ''Anime/PokemonJourneys'', without explanation, her look is now just like that in the games, with her having black hair and wearing a kimono.

** 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, with Mirajane believing Nirvana just decided to drop them off for no reason while Lucy claims it dropped them because it wanted to walk faster. The anime removes this entirely by having Nirvana appear specifically with six legs upon its activation.

** [[spoiler: Goku originally came to Earth as a baby, and a head injury sustained sometime after landing caused his Saiyan nature to be pacified. In ''Minus,'' not only is it revealed that he was three years old by the time Bardock and Gine sent him to Earth, but the head injury is now an anime-only thing, and his nicer traits instead come from his mother.]]

* ''Anime/{{Pokemon}}'':

** The ''Best Wishes'' had what was essentially a retcon, though the original eps never aired. Team Plasma was supposed to meet and battle Team Rocket early in the Unova storyline, but the episodes were shelved because of the 2011 earthquake in Japan-part of the storyline involved the destruction of several buildings. Some hoped they might be aired later, but instead, the two teams finally met in the 'Season 2, Episode N' arc, the 'Adventures in Unova' arc in the US. This retconned the plots of the unaired eps out of existence.

** [[spoiler: In addition, Goku's new age even [[InvertedTrope retcons a previous retcon]]. In the Pilaf Saga, his age is stated to be 14 after the 16-year-old Bulma asks what his age is. The TournamentArc the following year reveals that he's 12 (11 back then) and that he only thought he was 14 because he was bad (or in [[IdiotHero Goku's]] case, worse) with numbers; this initially makes him younger than the 13-year-old Krillin. Now that he's 3 by the time he touches down on Earth, since we also see a 5-year-old Bulma during ''Jaco's'' time period, this ''actually'' makes Goku 14 by the time ''Dragon Ball'' starts. This in turn makes him significantly ''older'' than Krillin, as well as only slightly younger than Yamcha or Tenshinhan, despite still being around Krillin's height at the time.]]

** [[spoiler: In addition, Goku's new age even [[InvertedTrope retcons a previous retcon]]. In the Pilaf Saga, his age is stated to be 14 after the 16-year-old Bulma asks what his age is. The TournamentArc the following year reveals that he's 12 (11 back then) and that he only thought he was 14 because he was bad (or in [[IdiotHero Goku's]] case, worse) with numbers; this initially makes him younger than the 13-year-old Krillin. Now that he's 3 by the time he touches down on Earth, since we also see a 5-year-old Bulma during ''Jaco's'' time period, this ''actually'' makes Goku 14 by the time ''Dragon Ball'' starts, in turn making him ''older'' than Krillin.]]

* In ''Manga/WanderingSon'', when CoolBigSis Yuki met Takatsuki it was heavily implied she was drawn to him because she knew he was [[{{transgender}} biologically female]] and nervous about being out as a boy for the first time. Despite this several chapters later she seems genuinely surprised when he [[UnsettlingGenderReveal reveals his sex]], though she could have been surprised at Nitori coming out.

** Speaking of GM Type C, sources just couldn't agree whether it was produced after the One Year War or near the end of the war. This came to an end when Anime/MobileSuitGundamMSIGLOO established that a massive number of them took place in the Battle of A Baoa Qu (the final battle of the war). IGLOO 2 also retconned GM Ground Types into the Battle of Odessa.

** The biggest retcon introduced by ''Anime/MobileSuitGundamThe08thMSTeam'' was giving the Federation mass produced mobile suits before the attack on Jaburo, but it also introduced the GM Early Type, an early production type GM... that for some reason, looks exactly like the GM Type C from ''Anime/MobileSuitGundam0083StardustMemory'', a ''late production'' variant of the GM. The Master Grade GM Type C manual retconned the former into a prototype of the latter, but the GM Early Type remained such a confusing addition that it was left untouched by virtually ''all'' expanded universe material afterwards.

** ''Anime/MobileSuitGundamThe08thMSTeam'' introduced the GM Early Type, an early production type GM... that for some reason, looks exactly like the GM Type C from ''Anime/MobileSuitGundam0083StardustMemory'', a ''late production'' variant of the GM. The Master Grade GM Type C manual retconned the former into a prototype of the latter, but the GM Early Type remained such a confusing addition that it was left untouched by virtually ''all'' expanded universe material afterwards.