Don't like that something happened in an anime or manga? For fandom, it's simple! Just write it out of existence and pretend it didn't happen.
Note 1: Do not include examples based only in adaptations. Adaptations can not be discontinuous since it is not part of the continuity of the original.
Note 2: Personal examples should not be posted here. The examples posted here should only be of groups of fandoms.
This is common with anime Filler, that is parts added by the adaptation that is not there in the manga. Many fans who like the anime prefer to skip the filler and ignore it in the overall work. Whilst some filler is liked, especially if it gives focus to well-liked side characters, as a rule it has inferior writing, sometimes sits badly with the main canon, and has no impact on the ongoing storyline or setting. This last point, that it is never touched on again except by other filler stories, makes it easier to relegate to discontinuity.
Many fans decry the Distant Finale of Digimon Adventure 02 for giving most of them completely random careers some to Character Derailment levels For instance, Matt — with his love of music and a fledgling garage band well in the works — dumps all that to become an astronaut. Worse is Yolei: outspoken and headstrong in the series proper, a House Wife in the future. Fans of certain ships also disregard the finale for sinking their opinions (for instance Sora and Matt end up together, which does not make fans who pair her with Tai happy). The drama CDs and the Girls' Day special CD try to explain the changes in lifestyles away, to little avail.
Similarly, many fans ignore the Bittersweet Ending of Digimon Tamers, where the kids are separated from their Digimon and it's left ambiguous as to whether they'll see them again. One of the movies (made without the input of the original creative team) revealed that the kids reunited with the Digimon fairly quickly (though incidentally, this issue was only ever mentioned in the dub). Canon Discontinuity was declared with the release of the drama CDs, which said that The Stinger at the end of the series never amounted to anything, and the kids have gone several years without their Digimon with no indication they'll see each other again (Konaka elaborates on his website that the film isn't canon, that the lack of his input is the source of the continuity errors which already make the film's canon status debatable and that the reason the film gives for Ruki's behavior - case in point, her lack of a father figure - is incorrect). Guess which one fans prefer.
And now Digimon Xros Wars: The Young Hunters Leaping Through Time never happened, according to the fans anyway. Most likely due to near the entire show being filler, most of the plot happening in the final 3 episodes, 2 plot twists that come out of nowhere (Psychemon being Quartzmon, and the Watch Man being a reincarnated Bagramon) and blatant Canon SueTagiru hogging the spotlight way more than a protagonist needs to. How bad does it get? All the previous heroes from the previous shows become living power ups for Tagiru, who fights the final battle alone.
Because of plot holes and overall silliness, many Dragon Ball fans reject Dragonball GT altogether, made easier due to the fact that it was not part of Toriyama's original manga; ironically GT has the least amount of plotholes period (although extremely glaring) and the overall silly behavior is very reminiscent of the first Dragon Ball series. And while Toriyama DID help conceive GT in some small parts here and there (including overseeing production of GT, a general groundwork of GT's storyline, and the very beloved Super Saiyan 4), his more direct contributions to the the latest game Dragon Ball Online and the film Battle of the Gods have fans convinced that GT never happened while stating the former being canon (although it is written in a way that GT could have happened before the former and after the latter). It's not like Alternate Timelines don't exist, but that seems to be the case here. And fanon discontinuity in the dragon ball series seems to be going back and forth between whether or not it was in the original Manga or whether or not Akira Toriyama had major involvement in it. Reportedly, the man supported GT and considers it a part of the series but this glides right over the heads of many disgruntled fans.
GT is a weird case of discontinuity. Most of the fandom ignores anything that happened, but one of its most popular pairings (Trunks/Pan) is based solely on GT events. Probably because in Z, Trunks and Pan never interact and Pan is 4.
Of course, this age difference isn't much better in GT as Trunks is 28 and Pan is 14. Or in going by the original planning notes in the Perfect File (5 years after Z vs. 10), Pan would be 9 and Trunks would be 23. The "10 years later" proclamation seems to stem from early misconceptions about the series, to the point where it was used in Funimation's dub.
It's not too unheard of for fans to discontinue everything after the "kid Goku" arcs, in essence everything Z and afterwards.
Members of the current Pokémon fandom are more likely to ignore just Johto Journeys, Johto League Champions, and most of Master Quest, skipping straight from the Orange Islands to either the end of Johto or to Hoenn, or just ignore everything after Kanto entirely
Battle Frontier also gets some of this from fans of the 4Kids dub.
Also many fans of the first series tend to not accept the new episodes mainly because they got rid of Misty.
Yu-Gi-Oh! 5Ds was well received by fans of the franchise, especially those who have been sticking with it since at least the beginning of the new series. That is until episode 107 when the big bad of the current arc revealed that he is secretly... a robot motorcycle centaur. Wait, what?
Most fans were not fussed when 4Kids decided to omit the last season of Yu-Gi-Oh! GX. It does have unfortunate implications as far as the fate of Jaden is concerned, but that's still better than having the fourth season and its unfortunate implications as far as the fate of the world is concerned.
Some people disregard the third season of 5D's in its entirety, citing filler, Invincible Heroes, and bad characterization. Others disregard the second season (or just the way it handled Aki and Crow), or 5D's itself for COD GAEMS AWN MOTERBYKZ. Then you have Yu-Gi-Oh! GX fans, who disregard the slow, silly, and badly-plotted fourth season, as above, the oppressively dark and Fridge Logic-filled third season, or the whole show again. Then you have fans of the original, who will tell you that some or all of the filler arcs never occurred, will tell you that the dark and somewhat incomprehensible Millennium World arc never occurred, and features a contingent that puts forth the theory that the entire franchise ended at the end of the old "Monster World" arc in the manga, which occurred right before the Duelist Kingdom arc began and the series became Merchandise-Driven.
The latest revelation resulted in what could be the biggest explosion of Yu-Gi-Oh! history. The 'Zone=/=Yusei' twist left fans reeling after weeks of foreshadowing to the theory being proven right, only to get completely stamped on and thrown out the window all of a sudden. The fans have been torn into three camps those who cannot accept this, those who can wholeheartedly and those who can accept it, but aren't best pleased. The former are coming up with new theories just to ignore the canon's explanation; a scientist wanted to recreate himself as Yusei to give hope to everyone, including looking up Internet files that included Accel and Delta Accel Synchro already learned by Yusei; including Zone being forgotten loner Sly amongst others. It doesn't help that the episode before finished with half of Zone's mask falling off, revealing Yusei's face which gave fans hope they'd both get decent Character Development. Quite a few are on the lines of ignoring the duel completely and focusing on the finale.
The fandom is divided on whether or not to accept Nia's death at the end of Tengen Toppa Gurren Lagann. Those who dislike it because it ignores the show's established premise of "nothing is inevitable/impossible" consider the show to end at the kiss between Simon and Nia at their wedding, ignoring the rest of the series finale.
In addition, just about everyone agrees that most of episode 4 never happened, mainly because the episode has a completely different (and worse) style from the rest of the series because of a different director. Even the official manga adaption rewrote that part, removing the weird puffball Beastmen and introducing Kittan and his sisters around the time of Viral's attack. Part of this is also a reaction to the producer insulting everyone at 2ch and stating that he hates Otaku even though Studio Gainax's main fanbase is Otaku — and the owner openly proclaimed himself to be one — and then resigned.
Simon: You can't do that! You can't just skip reality!
Kamina: Of course I can! Who the hell do you think I am!?!
Then you have the people who ignore everything after Kamina's death in episode 8.
Neon Genesis Evangelion practically invites you to do this. Some people think the last two episodes of the series and End of Evangelion cover the same events from different points of view; some think they're different, accept End of Evangelion as the ending, and disregard the TV series' ending; some only accept the ending of the TV series and disregard the movie; and some reject both endings. With the four-part movie Rebuild supposedly getting a new ending of its own, there will be a third possible ending to further divide the fanbase.
The issue is only further complicated by the fact that many fans cannot agree on what the hell happened in either of those endings.
It's also complicated by the fact that Rebuild doesn't just have a new ending...it also has a new middle. And a new late beginning.
Similar to the Wall of Fire from Scientology, this may....very well be the best. If a proper explanation was given, the relevation would be....utter despair at how stupid it all actually was. Let us pretend it was indeed a Majestic Work of Nonsensically Sensical Art and be done with it.
A earlier series by Gainax, Nadia The Secret of Blue Water, suffered from a 12-episode filler arc shoehorned into the middle of the series after its early success earned it a sudden half-season extension. These episodes are not only animated poorly, but they also warp the characters' personalities with stories that are not only useless, but also incoherent. Some fans argue that these episodes provide character development, but other fans (and critics) suggest that skipping them altogether would benefit the series as a whole (a sentiment shared by director Hideaki Anno, who admitted that he would've saved only episodes 30 and 31, which contain genuine plot elements; in fact, Anno created a compilation of the series, called "The Nautilus Story", which deletes much of these unnecessary episodes). Similarly, when the series returns to its roots in Episode 35, it quickly forgets these episodes (save 30 and 31), further suggesting they were never supposed to happen in the first place.
The Abridged Series of Naruto takes this trope to its logical conclusion by producing its own version of the fight between Naruto and Kiba, in which the loss is at least honorable, rather than having Naruto win by virtue of an accidental fart. It insists that the Abridged version is how it happened.
In the Shipping Fandom, ALL sides (especially the Big Three NaruSaku, NaruHina, and SasuSaku, as well as NaruSasu) like to ignore some parts of the manga that support other couples. Some (extreme) NaruHina and SasuSaku fans refuse to believe/remember any chapters/pages that could hint at NaruSaku. Some (also extreme) NaruSaku fans downplay Hinata's actions(especially the Pain battle). Goes even further when the characters themselves suffer from discontinuity(particularly Sakura who suffers to the extreme) in that thoughts, feelings, words, and actions are ignored just because it could be used as support for the other pairing.
After chapter 449, some fans seem to just tell themselves that Pain never invaded Konoha. Konoha's a crater now because of a sinkhole that appeared offscreen.
Those that did enjoy the Invasion arc usually don't have goodthings to say about the anime's rendition of it. Of special note is Shippuden episode 167, which was massively criticized for its art style.
The fandom has gone into apoplectic fits trying to reconcile Itachi's sudden Heel-Face Turn during his fight with Sasuke. The problem isn't so much the idea of him having been secretly loyal to Konoha all these years, but the fact that there was nothing whatsoever in the manga even suggesting such a thing, making the revelation seem like a Shocking Swerve out of left field.
After said revelation, Sasuke haters tended to forget that Itachi pretty much destroyed his sanity. The fan discontinuity from both ends of the Itachi-reaction spectrum was pretty astounding.
Some fans are just disgusted by the notion of genocide as a peace-keeping measure (he killed civilians, babies, etc). Though it seemed the Uchiha clan didn't have any kids other than Sasuke, Itachi's friends and maybe Shisui, and it was stated that with the exception of Sasuke, the entire Uchiha were a part of the plot, so none could be considered innocent (but this could also be a lie stated by Tobi).
A truly disturbing number of fanfic authors write off Haku's declaration that he's a boy. Fem!Haku is almost more prevalent than Canon!Haku, especially in stories that keep him alive.
In many cases, to enable Haku to be used in non-Yaoi pairings with Naruto and other ones.
In general, a great number of fans (or haters) of any characters tend to reject pieces of canon that show the characters in a negative (or positive) light.
Some fans haven't reacted well to the revelation that Tobi is actually Obito, feeling that it ruins both characters and that Tobi's motivation for his schemes are petty.
To quite a few Bleach fans, Yammy really is the 10th Espada, and there is no such thing as a 0 Espada.
This is partly because there is actual evidence. It took Kenpachi serious effort to hurt Nnoitra at all (Before the spoonhead even released), but he was slicing limbs off of Yammy as easily as if he were a really big hollow.
Justified, however, given that Nnoitra had the strongest hierro and Kenpachi observed at the time that he'd been forced to learn to adapt to it before he could start injuring Nnoitra. Since Nnoitra had the strongest hierro of all espada, once Kenpachi had adapted to fighting hierro of that level of strength, other espada would naturally have been easier to cut (going solely by hierro, that is). Yammi was also specified from the moment he first entered the storyline as being strong but both unskilled and very stupid, two abilities that consistently got him into trouble even when he shouldn't have been from his very first introduction.
This is actually explained by the databook. The Espada are ranked by reiatsu upon release; Yammy has the most because his increases in proportion to his anger. However, he also lacks any unique abilities (which made the other nine Espada—or even your run-of-the-mill Arrancar—so damned deadly) as a tradeoff, forcing him to rely on nothing more than brute strength and basic Hollow powers. Hence, Kenpachi and Byakuya are able to make mincemeat of him; they eventually decide he's Not Worth Killing and leave his broken body in Hueco Mundo to die. Essentially, Yammy is the poster boy for Blessed with Suck and Master of None among Aizen's army. Sucks to be him.
Even this explanation isn't enough to sway some fans. It was made pretty clear in the Soul Society arc—and outright stated by Aizen when he fought Soi Fon—that a fight between two spiritual beings is primarily decided by who has the most spiritual power. It's stated repeatedly that the main reason Ichigo can go toe-to-toe with people who have decades, if not centuries, of experience over him is because of his freakishly high reiatsu. Kenpachi himself is one of the most consistently dangerous characters in the series despite the fact that he's just like Yammy—relying solely on power with no special abilities, and who in fact intentionally avoids using proper fighting techniques just so he can enjoy a fight. The lesson seems to be that brute strength only matters if you're on the good guys side. Anyone else is screwed.
The Fullbringer arc gets this for a variety of reasons. First is the fact that the previous arc ended abruptly with many plot threads and character fates hanging in the air as the story switched back to the world of the living. The newly introduced Fullbringers were disliked by many, either disliking them, disliking the vagueness of their powers, disliking that they didn't seem to have a specific motive for helping Ichigo or just thinking that they were too similar to the Vizard. The fact that most of them are beaten right off the bat by the shinigami after revealing their motives without putting up a decent fight only made this worse. To top it all off, the main villain is beaten in the span of one chapter after Ichigo goes all out, and the arc ends without us finding anything about his past or why he was angry at the shinigami. Many fans feel that the arc was no better than a filler arc, seeming completely irrelevant beyond giving Ichigo his powers back.
And then there are some fans who pretend that the series had ended after Aizen's defeat. Due to the fact that the Arrancar ended up running longer than Kubo had intended, a lot of people assumed that the series was building to a final battle with Aizen, and expected his defeat to cap off the series.
Heck, there are some fans who think the series ended after the FIRST season, and refuse to follow the story after the end of the Soul Society Arc.
To most Saber Marionette J watchers, the anime only has 25 episodes, ending when Lorelei and Otaru discussed the Heroic Sacrifice of Cherry, Lime, and Bloodberry, and Otaru walked off upset and missing them, instead of all three of them coming back to life as if nothing ever happened without any logical explanation.
There are several points in Death Note where fans often invoke this trope. There's when Light regains his memory and (re)turns evil; some people ignore that and everything that happened afterward, considering Light to have remained L's partner instead. Some ignore what happened shortly afterward, L's death; some or accept the previous spoiler, but reject everything that occurred after it; some accept everything until the ending of the series, when Light is killed. Complicating things further, the anime (slightly) adjusts the manga's ending. Light still dies, but he dies with slightly more dignity, managing to escape but then getting killed by Ryuk, who doesn't want to be bored while Light's in prison. In the manga, he has a Freak Out prior to his death.
There are also fans who don't like the Foe Yay added in episode 25, to the point of pretending it never happened.
A small fandom accept it as fanservice while a bigger one hate how it made L look like he accepted defeat.
Many fans are displeased by and choose to ignore how Word of God interprets Light and L's relation, and such, in How To Read.
Some fans didn't accept Flay's death at the end of Gundam SEED; either they pretend it didn't happen, or they go the Fix Fic route.
Many Heero/Duo shippers gleefully point to director Masashi Ikeda's comment in an interview with Animerica that he didn't intend on a Heero/Relena romance as "evidence" that Heero was gay, and thereby confirming their ship, willfully ignoring that Ikeda went on to say that he felt that the political and symbolic relationship between Heero and Relena was more important than a possible romance, that he hadn't intended there to be any romance of any persuasion in the series at all (simply because he felt that he wasn't any good at writing "boy/girl" romance to begin with), and especially that he said that even though he hadn't planned for Heero and Relena to be a couple, it didn't mean that they would never become one. In fact, Ikeda admitted that he was able to see Heero and Relena as a couple somewhere down the line.
A more specific example is "Relena Censoring", in which Yaoi Fangirls took official manga like Blind Target and cut out all appearances by and references to Relena Darlian/Peacecraft. Of course, the focus was entirely on Shipping, which shows in all the Plot Holes Relena's disappearance opens up.
The live-action/CGI movie G-Saviour is in a funny place in regards to this: Sunrise has never officially said it's non-canon, but they also "do not like to talk about it", and many fans don't count it as a Gundam story. Other fans compromise by sticking it in an Alternate Continuity.
For fans whom preferred the Reservoir Dogs ending of the first season of Mobile Suit Gundam 00 reject the second season for doing an almost complete reversal of where the series seemed to be going. The same for the official movie, which wasn't what many people expected.
Several, if not most, fans were outraged at the effective Character Derailment of Manaka and Toujo at the end of Strawberry 100%, when, after all the not-so-subtle hinting that he and Toujo were a Red String of Fate couple and she was the only one he was truly happy with, could relate to, etc., he goes and picks Nishino out of pity or "she was there first" more than anything else, and she doesn't even put up a fight. Most like to imagine that, in the author's private gallery, the real ending exists in which he comes to his senses and chooses the right one at the end; the "official" one was published due to Executive Meddling. These fans reject this turn of events hard because it ruins a comic that was otherwise a masterpiece.
And some consider it a masterpiece because of that ending. It's a matter of priorities.
Many fans of Saikano believe that the series should have ended on episode 10 with Shuji and Chise running away together, instead of all the (additional) Angst and doom we get bombarded with in the next 3 episodes.
Just to drive the point home, there's a fansub of episode ten that states immediately after that episode's ending:
The manga scanalations have a very similar warning at the end of the second volume. It's a seven-volume series.
In Full Metal Panic!, many fans want to pretend that Kalinin's betrayal never happened. After his touching backstory with young Sousuke was released, his Face-Heel Turn just didn't sit well. The one person it seemed he would never betray had been Sousuke, since he felt great guilt and felt that he owed him and thought of him as a son.
That was the point, Kalinin didn't see it as a betrayal of their past together, but as the only way to make all the bad things that had happened to them both go away, so that they could be happy together with all their dead loved ones as well. It may seem ruthless to us innocent civilians, but Kalinin does nor fit that description, and had previously shown a ruthless streak of character that makes this turn of events more than believable.
Also, Kaname's sudden transformation from a capable Action Girl who matches Sousuke well into a BrainwashedDamsel in Distress who follows Leonard around. Most people like to believe this development didn't occur.
Code Geass fans are very divided over the official ending as declared by the Word of God in which Lelouch dies for real at the end of the series.
This has spawned a number of theories, pointing out the uncertain nature of being a Code Bearer and how the immortality is transferred. The series reveals that it is transferred from person to person when the Geass evolves to where it occupies both eyes permanently, at which point the Code is taken. Fans point to the fact that Charles responded to Lelouch's command when he shot himself as proof that he did not have his Code active at the time.
There is also the fact that Lelouch technically does kill a Code Bearer while his Geass is at full power. From what little we know, it could be seen as a transfer.
The Zero Requiem itself is considered Fanon Discontinuity by some viewers, for the following reasons: 1) it involved Lelouch being even worse than ever before; and 2) nature abhors a vacuum, meaning that whatever peace that would be gained wouldn't be everlasting, and a new conflict would arise sooner or later. The show itself doesn't deny this last possibility but prefers to focus on the short term benefits instead. From side materials and the events right before it, it's evident that Lelouch was looking for an excuse to off himself following Nunnally's apparent demise and the Black Knights turning on him, among other events, which left him practically all by himself. This suicidal behaviour is actually in character for him, as he goes on several psychotic mind trips during the series, most notably, when he meets with Euphemia to derail her intentions and enact a plan of his own design that would, unbeknownst to him, result in catastrophic failure, simply because he believes that his plans are better than hers. However, unlike then, once it's revealed that Nunnally is alive, no one talks him out of it, because all his allies are suicidal, uncaring, or want to kill him, and all the people who would stop him aren't his allies by design, so that they wouldn't miss him when they died.
Certain elements of the epilogue also seem rather unusual. Kallen's mother is still bedridden and we don't see her speak, despite the supposedly upbeat monologue from Kallen; Xingke not appearing, implying that he died off screen, much to the dismay of those fans who liked him, without any major issues; Ohgi being named president of Japan, despite the series painting him as generally incompetent at leadership and the fact that he was the one responsible for the betrayal, and by proxy, the Zero Requiem; etc.
For the record, Word of God says Xingke is fine, he just wasn't at that particular ceremony.
Some time after the end of the anime, Sunrise released the "Birthday of Miracles" picture drama, in which an evil eunuch takes over Ashford Academy with terrorists, and all the good guys work together to save the day. All the characters who died are there as if they always had been, but all of them — including Lelouch — vanish after it's over and Nunnally remarks that the day was his birthday and she believes they came back one last time to say goodbye. This seems to be a pretty solid way to say "He's gone, accept it."
Then there are those who prefer to ignore the whole second season and pretend Code Geass ended in a Cliff Hanger.
Endless Eight. A lengthy repetition of time, plot, and scenery. Not to mention more than half of the second season of Haruhi Suzumiya. As soon as the arc ended, all of the Image Boards celebrated.
This was what Kyo Ani was aiming for, as they didn't want to do the 8 episodes that Kadokawa asked.
The Lucky Star fandom dismisses Konata's comment on her not being lesbian as her being in the closet, not realizing it, or just plain out ignoring the quote. The fandom also ignores anything post-high school, manga-wise.
For the most part, the Tenchi Muyo! fandom would simply prefer to believe that the third OVA never existed.
The Fist of the North Star manga is often divided into two major eras: the Raoh-era ("the good era"); and the post-Time Skip-era ("the not-so-good era"). Originally, Buronson and Tetsuo Hara intended to end the manga with the death of Kenshiro's main rival Raoh. However, due to contractual obligations they had with Shueisha, they were forced to extend the manga's storyline by a few years. This led to the sudden introductions of other rival martial art schools for Kenshiro to face that were somehow not around during the earlier conflicts, too much emphasis on ki-based attacks (when they were originally used only for special occasions), and the sudden appearances of way too many long lost relatives (especially Raoh's brother Kaioh, a character who can easily be described as "Raoh with a scar on his face"). Many of the more recent spin-off works and side-stories rarely acknowledge any of the events after the death of Raoh, outside of a few plot points (like the retconned origin story of how Raoh, Toki, and Kenshiro were originally refuges from Shura).
Lupin III is subject to this at times, mostly because of its status as a Long Runner. Especially with the Milestone Celebration anime movies. Most fans like to think that Pycal dies at the end of his original appearance. The 30th anniversary special Return Of The Magician doesn't exist. And while Green vs. Red wasn't considered bad, most of the fandom prefers to think of it as being an alternate canon due to how it implies that Lupin the Third is not a single man, but a title passed down throughout the years. Or that he wants to retire and picked a ramen shop-worker to take his place.
One wonders how these fans will react now that the Japanese voice actors for Zenigata, Goemon, and Fujiko have been replaced (aside from the death of Lupin's original VA, there had been no cast changes at all since 1977).
Takatsuki deciding that she's comfortable being a girl and doesn't want to transition caused a stir in the fanbase and many fans ignore it or create theories to get past it.
Some Black Butler fans LOVE forgetting that Grell is a male to female transsexual, despite the Word of God. Becomes specially ugly if we're talking of rabid Yaoi Fangirls who hate the idea that Grell/Sebastian is actually het instead of yaoi. (Though, to be fair, if one hasn't read said Word of God and doesn't know it exists, it's easy to read her as merely hopeful.)
There's also a sizable contingent in Black Butler fandom which disavows the second series because of its ending, in which Ciel becomes a demon, forcing Sebastian to be his servant for all eternity, since he now has no mortal soul with which to pay for services rendered.. In fact, even some who otherwise love the second series have been heard to shun the ending.
Canaan fans, especially shippers, prefer to forget the whole "Canaan and Maria went their separate ways and never met again" part of the ending.
One of the few aspects of Magical Record Lyrical Nanoha Force that most English fans agree on is that it's a terrible story and didn't happen...but good luck getting them to agree on why.
Maetel Legend is the prequel to Galaxy Express 999, establishing the long suspected connection between 999 and Queen Millenia. Many feel that Millenia stood best on its own, especially if their only experience is the 1982 film. In Maetel Legend, the heroine of Queen Millenia, Yayoi Yukino is shown to become the evil Queen Promethium of 999. The turning of such a likeable character into a villain was probably the reason why many fans would prefer to forget Maetel Legend, especially since she had such a good sendoff in the 1982 Queen Millenia film
Shugo Chara! Party, the third season of Shugo Chara! is widely disliked by fans due to shortened episodes, shoving semi-main charactersOut of Focus, and focusing way too much on Rikka.
Some fans also dilike the later chapters of the manga due to focusing too much on romance and making the Guardian Characters artifacts, not to mention feeling very rushed in tone.
In Escaflowne, it's revealed that Bishounen baddie Dilandau is actually Allen Schezar's long-lost little sister, who was used for experiments, one of which included turning her into a boy, apparently to create some sort of supersoldier. Dilandau's numerous fangirls won't hear of it unless they're trying to justify a Mr. Seahorse scenario.
Given the possibility that a second season will never be made, many fans disregard the Gainax Ending of Panty & Stocking with Garterbelt, wherein Stocking turns out to have been The Mole this whole time, slices Panty into 666 pieces, and joins Corset in his mission to drill a hole to Hell. These fans will take the end as the ending credits of the last episode, and not the Sequel Hook.
Eureka Seven AO, for its cop-outs, Continuity Snarl, wasting of good plot threads, a lack of understanding of what happened to everyone but Eureka and Renton from the original show, and other assorted unpleasantness. The was solidified in the ending, which directly contradicted one of the most important themes in the original series. Funnily enough, because of the backstory's MASSIVE continuity snarl, it's not too hard to put it into discontinuity. *Deep Breath* Eureka is clearly from the original, yet the spec2 she pilots is the movie iteration (the original never had shoulder-mounted lasers). She's also piloting the spec2 well after it should have evolved and subsequently vanished, alongside Renton in the evolved version, and there's no explanation as to where she got this one. The End is in Generation Bleu's basement, intact and in its white color scheme, although shortly after being freed from said basement it gets vaporized by an IFO Right the fok out of nowhere. None of this is ever sufficiently explained. Therefore since the continuity with the original show and/or movie makes no sense, it can't be in the continuity of the original show. You're welcome.
Saint Seiya: apart from the almost puzzling differences among the Manga and the Anime in "classical versions" (that tend to be selectively ignored or accepted by the fans), the spin-off stories are constantly a target of it. While is (more or less) accepted that Saint Seiya Episode G is a pretty normal part of the continuity, the same cannot be said of Saint Seiya Omega (as many fans frowned upon, due to the introduction of new elements and huge changes in concepts) and Saint Seiya Next Dimension : largely despised by a vast number of fans due to plot, art and continuity severe problems .
As far as the Love Hina fandom is concerned, the anime franchise ended with the Christmas Special. The Spring Special and Love Hina Again never happened.
In the Mahou Sensei Negima! fandom, most fans have decided that the manga series had ended at Volume 18, given the fact that the next volume is the start to the Mundus Magicus arc and that the arc itself is quite the Base Breaker from within the Negima fandom.
While a few elements of it are liked, more than a few fans of Tsubasa Reservoir Chronicle ignore the 2nd half of the series due to it becoming a pretentious, angsty-for-the-sake-of-being-angsty Mind Screw (and not a very enjoyable one).
Even more fans completely ignore the 2nd half of the anime because...well, because frankly the animation studio did a crap job and just invented a whole bunch of fillers that never happened and annoyed the hell out of both fans and CLAMP.
When Kite failed to appear in the early plot of Hunter x Hunter's 2011 anime, many fans simply decided to assume his place in Gon's back-story was the same as in the manga, but was simply not shown. It was revealed at the beginning of the Chimera Ant arc that the encounter did take place. However, he had never actually introduced himself, and until his appearance in the Chimera Ant arc the two had never really met, being almost complete strangers. Many fans were revolted at these changes to the canon, and quite a few have even decided to (rather than disregarding the entire adaptation,) disregard all offending episodes, replacing them with corresponding manga chapters to keep the back-story as it was.
There are many fans who disregard the second season of Darker Than Black, for a number of reasons. There are some who don't like what it did to Hei's character and/or are squicked out by the Lolicon subtext. There are also those who simply feel it doesn't live up to the (admittedly high) standards set by its predecessor, or liked the ending of the first season and just felt this season unnecessary.
Much of the fan base for Bunny Drop prefers to pretend the series ended at the Time Skip. Switching from a story about a guy raising a six-year-old to a story about raising a teenager would have been contentious enough, but the series went out of its way to fabricate a romantic relationship between Daisuke and Rin — going so far as to contrive circumstances that prove they're not really related, which does nothing to dispel the Wife Husbandry implications. It also completely destroys the series' main moral for the sake of apparent Author Appeal. The producers of the anime seem to agree, given that they stopped right before the time skip.
Gunslinger Girl fans tend to ignore the second anime. It's pretty much a completely different adaptation of the series with new Japanese voices, different personalities, less accurate Gun Porn, and a worse art-style.
To many fans, the third Puella Magi Madoka Magica movie (Rebellion) never happened, thanks all to the Executive Meddling-induced ending where Homura basically undoes Madoka's wish at the end of the anime so that she can be with her. Word, love and obsession are two different things. The real Homura would've wished to be with goddess-Madoka while she continue to save all their fellow Magical Girls.