History SeriesContinuityError / WesternAnimation

** In the season 14 "[[Recap/ArthurS14E2TheAgentOfChangeDWUntiesTheKnot D.W. Unties the Knot]]," D.W. is unaware that having a wedding means marrying someone, thinking it is nothing more than a fancy party. However, she witnessed her aunt getting married with her own eyes back in season 1's "[[Recap/ArthurS1E25DWThinksBigArthurCleansUp D.W. Thinks Big]]." She even makes a ContinuityNod to that episode in this one, so it's not a case of OutOfOrder either.

** In an episode, Sue Ellen is seen in a Kindergarten class photo when in fact she transferred in third grade.

** Another episode has Pal present when Arthur and D.W were younger, even though he was gotten when they were still their present age.

** In a flashback of "Arthur's Baby", a baby Mr Ratburn is called Emil by his mother while he scrawls multiplication sums on the wall. However, in future episodes, his first name is said to be Nigel.
** Mr. Haney's first name is Herb in the episodes "Arthur's Mystery Envelope" and "The Chips Are Down", but later episodes give him the name Francis.
** Mrs. [=MacGrady=]'s first name was originally Sara, but in "The Great [=MacGrady=]", it was changed to Leah, presumably in memory of Leah Ryan, who co-wrote the episode and passed away before it was completed.

** Roberto was killed off in “The Six Million Dollar Mon” after he eats a piece of skin from Hermès that causes him to melt and have his brain chip completely destroyed. However “Stench And Stenchibility” has Roberto show up alive and well to rob Zoidberg and Marianne without any explanation

** A total list of all instances in ''Franchise/TransformersGeneration1'' would fill a library, as continuity wasn't considered to be terribly important. Autobots fly! Now they don't! Surprise, I have [[NewPowersAsThePlotDemands a built-in tool]] to solve today's problem! [[ForgottenPhlebotinum Now I don't]]! However, there are a few that do affect the big picture:
*** The Constructicons.[[note]]Of whom there are six.[[/note]]Their introduction in "Heavy Metal War" discusses the Decepticons building them in the caves they were in at the time. Omega Supreme's backstory[[note]]In "The Secret of Omega Supreme"[[/note]], however, involves how the already-existing and formerly good (ignore the Decepticon symbols already on them, please!) Constructicons were turned evil by Megatron. ''Megatron's'' backstory? He was created by eight already-existing, ''already-evil'' Constructicons![[note]]As shown in "Five Faces of Darkness, Part 4".[[/note]] That's three Constructicon origins, none of which are at all compatible with either of the others. [[note]]With a bit of {{FanWank}} you could say "Heavy Metal War" shows them being rebuilt into Earth forms instead of being newly built, and "Five Faces of Darkness" does not state the Constructicons are already evil Decepticons. (Of the eight shown on screen, only one has anything even resembling a Decepticon insignia, and it’s one of the two extras!)[[/note]]
*** Cybertron's supercomputer Vector Sigma is shown in its debut to be the machine that gives Transformers life. Its activation is necessary for them to receive sentience... except the Constructicons and Dinobots--who, unlike the Constructicons, are only ever given one backstory--were already shown to have been built on Earth with no involvement from Vector Sigma, and no one in either group has any problem moving around or talking. In turn, later episodes would feature Trypticon and the Technobots being constructed on other planets with no involvement from said computer at all. (It's also claimed in the third season that the Quintessons built the Transformers, but note that these origins aren't necessarily mutually exclusive.)

*** In TheMovie, Unicron turns Skywarp and Bombshell into ''two'' identical robots that he refers to as "Cyclonus and his armada." A ''second'' Cyclonus is a rather poor "armada..." and only one Cyclonus is ever seen again. Who became Cyclonus and what happened to the other? Good question. (Oh, and Bombshell ''is seen again, not as Cyclonus.'' Voiced in-character, so not one of [=TFG1's=] zillions of "oops, we used the wrong animation model" cases.)
*** Awesomely {{lampshade|Hanging}}d in a comic that came with the Rodimus Vs. Cyclonus figures, but written by Creator/SimonFurman, so ''not'' the usual toy pack-in fluff. At one point, Cyclonus complains that he hasn't gotten any respect in ''either'' of his lives (referencing having been someone else on a ''few'' occasions, without ever saying who he used to be) and that he was supposed to get his own troops but they never materialized. Rodimus would later say to him "I don't know who you are, or even who you used to be, and I don't care!" as they get ready to fight.[[note]]The toy itself contains a continuity error: Rodimus is in his original car form, in which he was called Hot Rod, but his toys are all sold under the more trademarkable name "Rodimus" no matter the form. (Also handled amusingly and appropriately in the comic: Rodimus would either have to be called by a name that defies the toy the comic is packed with, or a name that is at odds with the story. As such, he never has ''either'' of his names spoken.)[[/note]]

*** As stated before, those are the ''biggies,'' the ones affecting continuity (in a show that's pretty episodic). Rare is the ''G1'' episode that doesn't have ''something'' in this category. Not that the other series are completely innocent, but G1 episodes were often rushed, and not checked for things like this, resulting in errors at the macro (Constructicons, Cyclonus and his armada) and micro (Ironhide goes to van mode and is robot mode in the very next shot and stays that way, Starscream's voice comes from his PaletteSwap Thundercracker in one shot) levels being ridiculously common.
** And, of course, the Anime/UnicronTrilogy, a dub of three series that were originally a ''duology'' and an independent series. Calling it a continuation makes ''Anime/TransformersCybertron'' a continuity headache, where characters who were dead are back without comment (or, in Sideways' case, without ''anyone remembering him.'') and a great many characters who were important [[BrotherChuck never turning up again]], and a couple of returning characters having ''radically'' different personalities, most glaringly Wing Saber. TheMasquerade is in effect and only Agent Franklin suspects there is something to the alien robots thing, though humans have known of, and worked alongside, Cybertronians for years as of the previous series. That's by no means the whole list of inconsistencies. [[AllThereInTheManual Read the supplementary materials]] if you want it all explained in a way that [[ContinuitySnarl arguably makes it all worse]].

* ''WesternAnimation/XMentheAnimatedSeries'':

** The ''Friendship is Magic'' episode "[[Recap/MyLittlePonyFriendshipIsMagicS8E11MoltDown Molt Down]]" established that dragons get their wings at puberty. In the first [[Recap/MyLittlePonyMakeYourMarkSpecial ''Make Your Mark'']] special, Sparky the dragon is born with wings. To date, no explanation for that has been offered.

** "[[Recap/MyLittlePonyFriendshipIsMagicS4E4DaringDont Daring Don't]]" features Ahuizotl attempting to perform a magic ritual which will bring 800 years of intense heat to the jungle, with Daring Do and Rainbow Dash putting a stop to it. Several seasons later, "[[Recap/MyLittlePonyFriendshipIsMagicS9E21DaringDoubt Daring Doubt]]" has him reveal that he is a guardian assigned to protect the Tenochtitlan jungle and the historical relics contained therein, and that his supposedly villainous behavior is the result of him being in danger of losing his job if Daring Do and Caballeron keep swiping artifacts from his territory. No particular explanation is provided for how this motivation and his original climate-manipulating plot are supposed to coexist.

*** In the distant past, Starscream and Skyfire go exploring a primitive planet that would later be named Earth. They transform into jet mode and depart. Wait, how did Starscream already has a [[CoolPlane F-15]] alt-mode 4 millions years before it will be invented?

** "[[Recap/MyLittlePonyFriendshipIsMagicS4E4DaringDont Daring Don't]]" features Ahuizotl attempting to perform a magic ritual which will bring 800 years of intense heat to the jungle, with Daring Do and Rainbow Dash putting a stop to it. Several seasons later, "[[Recap/MyLittlePonyFriendshipIsMagicS9E21DaringDoubt Daring Doubt]]" has him reveal that he is a guardian assigned to protect the Tenochtitlan jungle and the historical relics contained therein, and that his supposedly villainous behavior is the result of him being in danger of losing his job if Daring Do and Caballeron keep swiping artifacts from his territory. Never mind that if his plan back in "Daring Don't" had succeeded, it would have done massive damage to the ecosystem he claimed to be protecting.

* In the Season 1 episode of ''WesternAnimation/PeterPanAndThePirates'' "Slightly In Stone" the gang finds Captain Hook's severed skeletal hand clutching his sword in the crocodile's cave, however in the Season 2 episode "First Encounter" Peter took Hook's sword from him to cut off his hand.

** And, of course, the Anime/UnicronTrilogy, a dub of three series that were originally a ''duology'' and an independent series. Calling it a continuation makes ''Anime/TransformersCybertron'' a continuity headache, where characters who were dead are back without comment (or, in Sidewaysï case, without ''anyone remembering him.'') and a great many characters who were important [[BrotherChuck never turning up again]], and a couple of returning characters having ''radically'' different personalities, most glaringly Wing Saber. TheMasquerade is in effect and only Agent Franklin suspects there is something to the alien robots thing, though humans have known of, and worked alongside, Cybertronians for years as of the previous series. That's by no means the whole list of inconsistencies. [[AllThereInTheManual Read the supplementary materials]] if you want it all explained in a way that [[ContinuitySnarl arguably makes it all worse]].

* ''WesternAnimation/XMen'':

** Not only that, but the episode "Have Yourself a Goofy Christmas" ("A Very Goofy Christmas") from the movie "Mickey's Once Upon A Christmas", which is said to chronologically precede the cartoon series, while featuring Goofy, Max and Pete as next-door neighbours, they live in two very different houses in a very different suburb than the houses and suburb featured in the series or in the movie(both the series and the movie feature different houses and suburb). And Max appears to be 5 years old at the time and Pete's wife and kids are nowhere to be found. And nothing implies Pete has a wife and kids, which he ought to have. One has to wonder how Goofy and Max ended up living from a suburban house to a trailer and then back to a suburban house again. Though it's possible that "A Very Goofy Christmas" may not be in the same continuity as Goof Troop.

** In the original series, Bubbles was sometimes depicted as vegetarian. This is despite her regularly eating meat without issue, including the RunningGag where the Professor makes the girl's liver and onions.

** "[[Recap/MyLittlePonyFriendshipIsMagicS4E4DaringDont Daring Don't]]" features Ahuizotl attempting to perform a magic ritual which will bring 800 years of intense heat to the jungle, with Daring Do and Rainbow Dash putting a stop to it. Several seasons later, "[[Recap/MyLittlePonyFriendshipIsMagicS9E21DaringDoubt Daring Doubt]]" has him reveal that he is a guardian assigned to protect the Tenochtitlan jungle and the historical relics contained therein, and that his supposedly villainous behavior is the result of him being in danger of losing his job if Daring Do and Caballeron keep swiping artifacts from his territory. Never mind that if his plan back in "Daring Don't" had succeeded, it would have done massive damage to the ecosystem he claimed to be protecting.[[note]]If that's his idea of protecting the jungle, maybe he ''should'' be fired.[[/note]]

** ''WesternAnimation/Ben10AlienForce'' and ''WesternAnimation/Ben10UltimateAlien'' gets a lot of flak for its many continuity errors of the original series (it could be obviously due to Dwayne [=McDuffie=] lack of input to the original series). While ''WesternAnimation/Ben10Omniverse'' fixes some of UAF's continuity errors, even it suffers from continuity errors as well. All three sequels suffers from their own continuity as well.
** ''WesternAnimation/Ben10AlienForce'':
*** In the original series, the plumbers were a secret United States government organization that dealt with alien, and occasionally supernatural, threats to the planet Earth. The Plumbers went defunct years before the series began, when hostile alien activity severely declined. In Alien Force, they've been retconned into being intergalactic space police.

** There have been several examples of minor characters' names changing, and even more important secondary characters have inconsistent surnames (Token Williams becomes Token Black, Jimmy Swanson becomes Jimmy Valmer, etc.)

* The ''WesternAnimation/TotalDrama'' series has this fairly often.
** One episode, for example, claims that Lindsay has very large feet ([[InformedAttribute that we never see]]) when she takes off her (apparently very tight) boot. However, we see her barefoot in the TDI Playa des Losers episode, and it's as small as you would expect it to be.
** During the TDI special, Chris says that Owen is the youngest of three brothers (which is also stated to be the case by Owen's [[AllThereInTheManual online bio]]). In ''Action'', Owen gives anecdotes about his two ''younger'' brothers.
*** Also according the special, Katie and Sadie never realized they were on TV through the whole first season and didn't seem to want to be on TV, even though they sent in an audition tape.
** A lot of information about the characters comes from [[AllThereInTheManual their online bios]], but the show seems to contradict them fairly often. Similar to Owen, Geoff's bio says that he's the oldest of five brothers, while on the show he once mentions having at least one older brother. Trent's father is supposedly an accountant, but on the show he says he's a lawyer ([[WildMassGuessing maybe]] [[UnreliableNarrator he was lying]] to avoid eating that garbage?) There are at least hints of this in other places, like Harold supposedly having an older brother and a younger sister, but alluding to his sister as having psychology books as if she were in college (maybe she's a prodigy?).
** ''All-Stars'' was infamous for having arguably more of these than any other season and for said instances being extremely glaring. "Sundae, Muddy Sundae" is probably the most infamous case, as in the episode, Courtney claims being in the final 5 is the furthest she's ever made it on ''Total Drama'' despite the fact she came in fourth place in the second season, and later on, she finds herself unable to handle a sundae covered in bird vomit even though the third season established her as having a strong stomach that allowed her to do very well in an EatThat challenge.
** In the spinoff ''WesternAnimation/TotalDramaPresentsTheRidonculousRace'', Owen remarks that he wasn't upset about being eliminated as he had already won a million dollars. He actually only won a hundred thousand dollars in ''Island'' which he forfeited by accepting Chris' million dollar scavenger hunt. A few have speculated that Owen may have won a million dollars on another reality show he was on between ''Total Drama'' and ''Ridonculous Race'', since his partner Noah stated only he, not Owen, has lost every reality show he's been on.

** In the first episode, when Nightmare Moon escapes from her 1000 year imprisonment and reveals herself, nobody in Ponyville knows who she is except for Twilight Sparkle, who read about her in history and myth books. Later, the episode "Luna Eclipsed" establishes a holiday called Nightmare Night (similar to Halloween) that has been around ever since Nightmare Moon was first imprisoned and was created in her honor.
** In "Winter Wrap Up", Twilight Sparkle implies Ponyville has been around for hundreds of years. In "Family Appreciation Day", Ponyville was founded by Granny Smith's parents when she was a child, and there's no indication in the show that ponies (excluding the princesses) have abnormally long lifespans, implying that Ponyville is less than a hundred years old. The only possible explanations are that Twilight simply meant Earth Ponies as a ''whole'' have done Winter Wrap Up without magic for hundreds of years prior to the founding of Ponyville, or that Granny Smith was lying her ass off.
** "Starlight the Hypnotist" has Twilight Sparkle so terrified of ladybugs that just mentioning one is enough to send her into a panic due to some "[[NoodleIncident incident]]" between her and her brother. This is in spite of her actually having seen ladybugs in the past without incident .%%"Ladybugs awake" isn't an example per https://derpibooru.org/1966512

** [[WesternAnimation/BatmanTheAnimatedSeries Batman]] makes a comment that electricity has no effect on Clayface. Later in ''The New Batman Adventures'' and ''WesternAnimation/JusticeLeague'', Clayface is easily disabled by electric attacks.

*** The same episode has Cotton request Hank to pay a visit to the French woman he made love with in France, even though "Cotton's Plot" established that he'd only ever fought in Japan. In fact, a major [[JustForPun plot]] point in the latter episode was the revelation that Cotton was misremembering a lot of his supposed wartime experiences.

*** The Constructicons. Their introduction discusses the Decepticons building them in the caves they were in at the time. Omega Supreme's backstory, however, involves how the already-existing and formerly good (ignore the Decepticon symbols already on them, please!) Constructicons were turned evil by Megatron. ''Megatron's'' backstory? He was created by the already-existing, ''already-evil'' Constructicons! That's three Constructicon origins, none of which are at all compatible with either of the others.

** In "Smarten Up!", Billy interrupts Bookworm!Milkshakes' math problem involving a train to ask if the train can be filled with clowns named Carl, Larry, and Tim. Later episodes and the first movie would establish that Billy is afraid of clowns to a comical degree, making his request seem odd in retrospect.

* ''WesternAnimation/RegularShow'': In "Eggscellent", it was established that Rigby is violently allergic to eggs and he ended up hospitalized when he attempted to eat a giant omelet. If this were the case, then him previously eating a carton of them ''raw'' in the first "[[HalloweenEpisode Terror Tales of the Park]]" should've had even worse repercussions.

*** The same episode has Cotton implore Hank to pay a visit to the French woman he made love with in France, even though "Cotton's Plot" established that he'd only ever fought in Japan. In fact, a major [[JustForPun plot]] point in the latter episode was the revelation that Cotton was misremembering a lot of his supposed wartime experiences.