[[quoteright:288:[[Film/StarTrekNemesis http://static.tvtropes.org/pmwiki/pub/images/up-star_trek_nemesis.jpg]]]]
[[caption-width-right:288:Apparently Picard's clone forgot that he had hair at that age.]]

Sometimes, [[CharacterDevelopment characters develop over the course of a show]]. And sometimes, [[{{Flashback}} shows will present new scenes from earlier time periods]]. And sometimes, characters in a flashback will exhibit character unlike the way they acted before the time the flashback is occurring.

For example, when [[AliceAndBob Bob]] started on the show in 1991 he was characterized as a {{Jerkass}}, but became a JerkWithAHeartOfGold in 1993, and then just became a nice guy by 1995, but is shown in a recent flashback to 1990 to have been a NiceGuy in 1990, with no explanation/extenuating circumstances.

Usually, this happens unintentionally due to {{Flanderization}} and CharacterizationMarchesOn, often due to the too many flashbacks to track characterization in an ExpansionPackPast. This might be used to {{Retcon}} an existing flashback, maybe because it also had to be reshot since it was a FlashbackWithTheOtherDarrin. If you not only pick up your old characterization but also your old visual style, it's a RetrauxFlashback.

Trope name comes from "backporting," a concept in software development where features from a new codebase are imported to an older branch of development.


[[folder:Anime & Manga]]
* In ''Manga/OnePiece'' we have Luffy, the straw hat wearing hero. He got the hat, which is his NumberOneDime, as a 7-year-old. At the start of the series, where he is 17, this caused a problem for him because the hat would often fall off in battles so that he would have to make another person hold it for him. After the Alabasta arc, he gets a string strap for it so that he can have it hanging from his neck while fighting which gives him much more flexibility (probably because he was very close at losing the hat in the Alabasta arc). Some time later, we get a flashback to when he was 7 years old, and suddenly, it appears that he already had the string strap back then.
* ''Anime/{{Pokemon}}'':
** Whenever Ash appears in flashbacks he is an [[{{keet}} excitable]] FriendToAllLivingThings and an all-around NiceGuy. This is ignoring his personality in the ''Original Series'' (Kanto and Johto) where he was more of an IdiotHero, had more aggressive traits, and was stubborn. It was his CharacterDevelopment that transformed him into a more gentle character by Sinnoh.
** One episode also has Pikachu suffer amnesia, but still act kind-natured and naive, despite the fact that Pikachu started off a disobedient lazy {{Jerkass}} when Ash received him in the first episode.

[[folder: Audio Drama]]
* In the audiobook version of ''Literature/RedDwarf: Infinity Welcomes Careful Drivers'', Chris Barrie does an impression of Robert Lewellyn doing a [[FakeNationality Fake Canadian]] accent as Kryten, even though the scenes are based on Krytyen's Season II introduction episode, where he was played by David Ross sounding like [=C3P0=].

* Judge Anderson, a psychic Judge in the Dreddverse, was a very flippant and easy-going character when she first appeared in ''ComicBook/JudgeDredd'', though would get serious when the situation mandated it. As time went on, [[CharacterDevelopment she became]] a rather serious character most of the time, and her dominant mood was vague despair at the [[CrapsackWorld shape of the world]]. In late 2010, possibly as part of the buildup to the new ''Film/{{Dredd}}'' movie, Alan Grant started writing a {{prequel}} series, ''Cadet Anderson'', set [[ExactlyWhatItSaysOnTheTin during Anderson's days as a cadet]]. In the prequel series, she is a very serious character who wishes the world could be better, in seeming contrast to the fun and light-hearted lady who first fought Judge Death.

* In ''Film/StarTrekNemesis'', they show a picture of Jean-Luc Picard when he was young, and for some reason, he was bald, despite the fact that his balding had everything to do with his age, as previously shown in the show. This also makes the villain quite baffling. However, Creator/PatrickStewart himself really ''had'' lost his hair by this age, really muddling things. One handwave that swims dangerously close to being a VoodooShark is the fact that both the picture and Shinzon have stubble, indicating both the young Picard and his clone shaved their heads on purpose. Other flashback Picards with hair had just let it grow back.

[[folder:Live Action TV]]
* ''Series/TheBigBangTheory'': In the flashback episode "The Staircase Implementation," Sheldon acts like his current, flanderized self instead of his more socially conscious earlier persona, despite the fact that the episode takes place four years before the series begins.
* ''{{Frasier}}:'' Martin was supposedly insufferably crabby and unpleasant before Frasier moved back to Seattle, which is used to explain why Frasier rarely visited when he lived in Boston. Flashbacks in some later seasons definitely show family tension, but Martinís personality isnít noticeably different (heís even apologetic for what little crabbiness he displays), making a lot of the pre-series family drama a mostly InformedFlaw.
* Averted in ''Series/{{Lost}}'', which cuts around with its flashbacks, but keeps characterization as established when the scene takes place (noticeably when Shannon and Boone are shown shortly around the time of the crash, Shannon is still doing nothing but complaining.)
* Series VII of ''Series/RedDwarf'' contains flashbacks to shortly after the revival of Rimmer (Series I). The style of the 'H' on his head and his uniform were the ones from Series VII.
** Kryten's [[TheOtherDarrin changed appearance]] is handwaved by the explanation that Lister rebuilt him after a spacebike crash, yet a few episodes later we see a moving photograph of Kryten pre-crash and he looks ([[CanadaEh and speaks]]) the same as post-crash. Additionally, the other Series 4000 mechanoid we meet, Able, looks like the "rebuilt" Kryten as do his spare heads in "DNA" and "Beyond a Joke".
** The flashback in series 2's "Stasis Leak" to before the accident maintains the set design and props that were added to the bunk room in series 2.
* ''Series/{{Highlander the Series}}'': In the pilot, it is stated that Duncan has remained "out of the Game" for over a century. Later, throughout the series he is depicted in flashbacks defending himself from other Immortals and taking heads throughout said century.
* ''Series/MyNameIsEarl'' had this twice, both with heavy lampshades. Two flashbacks saw Earl being the good guy despite the show's entire premise being he was an awful person until he "discovered" Karma. One featured Earl saving Joy from a killer bee while his [[TheAce cousin]] cowered in a tent, and the other was his [[{{Retcon}} reasoning]] for [[AuthorsSavingThrow raising two kids who were not his own]]. Both were described as the only good thing he did before he made the list.
* ''Series/StarTrekTheNextGeneration'' had this in the series finale.
** The captain's chair shown in the past is the same one as the then-current chair, with little lights under the arm-rests instead of the folding panels the first season chair had.
** Past Worf's makeup design was slightly modified from the current version rather than being the version from the beginning of the series (which took much longer to apply and was more uncomfortable for the actor).


* ''Toys/{{Bionicle}}'' contains an {{enforced|Trope}} example. Originally, the [[{{Hobbits}} race of diminutive villagers]] was called "the Tohunga" until [[RealLifeWritesThePlot Maori activists sued the]] Franchise/{{LEGO}} Group for trying to UsefulNotes/Trademark words in their language. The Story team wrote a scene to [[MeaningfulRename change around a few names]], with the Tohunga becoming "the Matoran" in celebration of their newfound unity. That was until the story expanded beyond the island of Mata Nui with a {{Prequel}} arc. Since they certainly couldn't reuse the old names, the name "Tohunga" was {{retcon}}ned out, and the villager we of the Matoran race from the very beginning.

[[folder:Video Games]]
* ''Franchise/SonicTheHedgehog'':
** In ''VideoGame/SonicAdventure2'', there are numerous cutscenes which show Shadow fifty years ago. Throughout the game, he acquires numerous bits of equipment, and the items you've got are visible on his character model even in the flashback cutscenes.
** In the first ''VideoGame/SonicAdventure'' game, Tails and Amy have flashbacks dating back to the times of the classic Megadrive games. In them, Sonic, Tails and Amy are depicted in their modern designs. The devs apparently didn't feel like making alternate models for a few seconds worth of footage. This wasn't really a problem until ''VideoGame/SonicGenerations'' came out and established that the characters used to look like their classic designs in their younger years, though.
* ''[[VideoGame/SoulSeries Soulcalibur: Broken Destiny]]''[='=]s version of Yoshimitsu strongly resembles his ''VideoGame/{{Tekken}} 6'' appearance, where he looks like an alien rather than a samurai which is what he's supposed to be in the ''Soul'' series (it takes place centuries earlier). In the first ''Tekken'', Yoshimitsu looks more like a knight, which is more consistent with how he would have looked when the ''Soul'' series is set. Justified by the fact that the Yoshimitsu in both series are [[LegacyCharacter separate individuals bearing the same name]]. As theorized for years and finally confirmed in ''Soulcalibur V'' (which included a "Yoshimitsu the Second," the successor to the Yoshimitsu in the preceding four games), the leader of the Manji clan is whomever has ownership of a particular sword, also named Yoshimitsu, which is earned by [[KlingonPromotion defeating the previous Yoshimitsu in a]] DuelToTheDeath and assuming their name, allowing the cursed katana to accept them as their rightful wielder. The new Yoshimitsu then adopts the mannerisms, fighting style, and identity of their predecessor, [[LegacyImmortality thus continuing on the folk legend of Yoshimitsu]]. Beyond this, Yoshimitsu's design almost always changes between games (''[[DreamMatchGame Tekken Tag Tournament]]'' is the only exception to date, reusing his ''T3'' attire), and quite drastically. Even in his ''Soulcalibur'' appearances, where he conforms to a samurai-influenced aesthetic, does Yoshimitsu look wildly different between games.
* Averted in ''VideoGame/CrisisCore: VideoGame/FinalFantasyVII'', where despite having undergone {{Flanderization}} in sequels and spin-offs, Cloud [[CharacterRerailment acts really close to his original characterisation]] (or at least as close as you'd reasonably expect considering how much younger he is). Aerith also returns to being [[PluckyGirl bossy and intelligent]] rather than being IncorruptiblePurePureness and Yuffie goes back to being sneaky, sarcastic and manipulative rather than a goofy GenkiGirl.
* ''VideoGame/{{Portal 2}}'' changes the design on many items such as the elevators and the Material Emancipation Grills, yet when you return to destroyed areas from the first game they are fitted with the new design. Visiting "Old Aperture" later on reveals that these new designs were apparently in use in test chambers from decades before the first game took place. The devs specifically avoided this with the [[spoiler:original, burn-marked but intact CompanionCube]], though.
* ''[[VideoGame/MarioAndLuigiSuperstarSaga Mario & Luigi Superstar Saga + Bowser's Minions]]'' updates the standard Mario characters and species to resemble their equivalents in later RPGs, leading to things like the Toads being made into mere palette swaps and quite a few monsters being given designs based on the main series rather than the original game. It also brings over the Elite Trio and Dr Toadley from Bowser's Inside Story too, opening up a few plot holes in the process (the former are wearing outfits that mark their promotion in Dream Team, latter apparently never met the Mario Bros before Bowser's Inside Story).
* The recent ''Franchise/MortalKombat'' games are guilty of this; MK9's story picks up right after the previous game (Armageddon) but the characters all look as they do when we rewind and go back to the first tournament (Johnny has short brown hair rather than the longer blondish hair he had at the time, Sonya wears her black leather outfit and has her hair in a long ponytail instead of wearing a bomber jacket and having her hair shorter, etc). And Mortal Kombat X flashes back to the MKII part of MK9 and the characters look as they do in MKX rather than MK9!

[[folder:Web Comics]]
* This happens in ''Webcomic/MSPaintMasterpieces'', where Ferretvision and current strips contradict each other. In this case, though, it's a conscious retcon.
* In ''Webcomic/TemplarsOfTheShiftingVerse'' the narrative is heavy on flashbacks, and character defining moments often happen in the past

[[folder:Western Animation]]
* When Mr. Freeze was cloned in ''WesternAnimation/BatmanBeyond'', he was depicted as still being bald despite having hair when we see a pre-Freeze Victor Fries in ''WesternAnimation/BatmanTheAnimatedSeries'' -- though considering the clone later redeveloped Freeze's inability to tolerate warm temperatures, maybe it was a sign of CloneDegeneration.
* ''WesternAnimation/BatmanReturnOfTheCapedCrusaders'', a tie-in movie to the '60s ''Series/{{Batman}}'' show, has a mention of Alfred as having worked for the Waynes since Bruce was a child. However, this was an idea introduced post-''ComicBook/CrisisOnInfiniteEarths'' with ''ComicBook/BatmanYearOne'', which was around 20 years after the show ended, and pre-''[=CoIE=]'', Alfred only joined Bruce's employ after Dick Grayson became Robin.

[[folder:Real Life]]
* Try to remember an event from a long time ago and see if you can picture the people involved as they looked then instead of now. Unless you have a PhotographicMemory it's unlikely you can.