* AdoredByTheNetwork: Creator/CartoonNetwork gave this a huge buildup: a "sneak peek" six days before the premiere (which also aired on Boomerang and streamed on the website), a countdown bug on-screen the day ''of'' the premiere, and at least one rerun a day for the entire week afterward.
** The Latin American version of Cartoon Network brings this trope UpToEleven. They went to such extent to dedicate a whole day to the show. They also use them to announce the new stuff of the month and air reruns '''three''' times a day, everyday, and they often air clips of this show during the commercial breaks for no reason at all.
** Cartoon Network also put a lot of faith into the show by renewing a second season a week before the premier, though this could have been done as the show spends a long time in production. Cartoon Network later renewed the show for a fourth and fifth season before the third season had even started airing.
* TheDanza: The character Teri (the hypochondriac paper bear) is played by Teresa Gallagher. Given Teri is just a supporting character and Gallagher also voices one of the main cast, this was probably a coincidence.
* DawsonCasting: With the exception of the Watterson children (Anais' voice actor[[note]]Kyla Rae Kowalewski[[/note]] is a teenager while Gumball and Darwin's voice actors[[note]]both the past and current ones[[/note]] were/are 11 and 12 years old), the kid characters are played by adults (mostly Teresa Gallagher, Stefan Ashton Frank, Alix Wilton Regan, Adam Long, Max Cazier, Jessica [=McDonald=], Kerry Shale, and, in the case of Sussie the chin puppet, Aurelie Charbonnier[[note]]in season one[[/note]] and Fergus Craig[[note]]from season two to the present[[/note]])
* DevelopmentGag:
** "The Mystery": The yearbook pictures for Alan and Tina both use their designs from the Early Reel.
** "The Fridge": Nicole puts war paint on her face. The way she does it covers her whiskers, making them look longer, and thus more like they did in her character model before it was redesigned for the second season.
** "The Skull": When Clayton shapeshifts into Banana Joe's form, he looks like Joe's first season character model instead of his current one.
** "The Bumpkin": Gumball tries to escape school by [[CatapultToGlory sitting on one side of the seesaw while Hector stomps on the other]], the same thing he and Darwin did to try and escape from the school in the pilot.
** "The Storm": Masami's crush on Alan is funnier when you realize that they were a couple in the pitch pilot "Gumball."
** "The Tape": The group shot where Gumball almost [[TitleDrop says the show's name]] is very similar to the end of [[https://www.youtube.com/watch?v=W7uDvSITrlY one of the series's trailers]], except that was in front of the Watterson house and everyone managed to say it.
** "The Void": Darwin's CGI design from the pitch pilot (titled "Gumball") can be seen floating around.
** "The Shell": Gumball consoles Penny on her appearance [[spoiler:without her shell]] [[BrutalHonesty by pointing]] out she "looked like a big coconut with holes in it before". Said description is even more applicable to her design in the first season, which [[InformedSpecies looked more like a coconut than a peanut]].
* {{Defictionalization}}: [[Website/YouTube Elmore]] [[FictionalCounterpart Stream]] is now real...[[http://www.youtube.com/user/ElmoreStream sorta]].
* FakeAmerican: Most of the cast besides the voice actors for Gumball, Darwin, and Anais are Brits doing AmericanAccents. Technically averted with Dan Russell (the voice of Richard, Mr. Fitzgerald, Coach, and Tina in the first season), and Sandra Dickinson (the voice of Granny Jojo, Hector the giant's mother, the pink cupcake lady, the orange woman with the blue boy, and the first voice actor for Miss Simian), who are American actors based in the UK.
* FlashbackWithTheOtherDarrin: A flashback in "The Name" redubs a scene from the first season episode "The Curse" with Gumball's third season voice actor. The same goes for a flashback with Darwin in "The Extras" to the second season episode "The Sweaters"..
* HeyItsThatVoice: Anais is [[WesternAnimation/AdventureTime Me-Mow]] (Kyla Rae Kowalewski).
** In Japan, Gumball is reportedly Creator/JunkoTakeuchi, a.k.a. [[Manga/{{Naruto}} Naruto Uzumaki]].
** Granny [=JoJo=] and Miss Simian (first season only) is Sandra Searles Dickson ([[Series/TheHitchhikersGuideToTheGalaxy Trillian]])
** The first voice of Darwin voiced Gossamer the monster on ''TheLooneyTunesShow'' and was in the Tyler Perry movie, ''I Can Do Bad All By Myself'' (Kwesi Boakye). His replacement voice (Terrell Ransom, Jr.) was on such American shows as ''Days of Our Lives'', ''The Middle,'' and ''Children's Hospital''.
** Creator/BrianBlessed is the homeless amnesiac drifter who is revealed to be [[ChristmasEpisode Santa Claus]] on the episode "Christmas."
** In the French dub, Richard (Papa) is the same voice actor used to dub [[WesternAnimation/RegularShow Benson, Muscle Man]], [[Manga/{{Naruto}} Gaara]], and [[WesternAnimation/TotalDrama Trent]] (''Total Drama'' version, not ''{{Daria}}'').
** In Brazil and Poland, Nicole's voice actress is the same one who voices [[WesternAnimation/JusticeLeague Wonder Woman]].
*** Interestingly, the Brazilian Nicole and Richard have mentored [[Series/{{Glee}} Rachel Berry]]; Richard used to be Rachel's high school teacher, whereas Nicole is her current dance instructor. [[note]]Nicole didn't date Finn Hudson.[[/note]]
** In Hungary and Italy, Gumball is [[WesternAnimation/ParaNorman Neil Downe]].
* NonSingingVoice: Unlike other musical numbers Darwin is in (barring ones where it's obviously supposed to be a different voice like "No More Mr Nice Guy!"), "What He Thinks About Us!" in "The Words" is performed by a different voice actor than his usual one.
* TheOtherDarrin:
** Gumball was voiced by Nicky Jones (aka WesternAnimation/{{Chowder}}) in the early reel version of the show (which is named "Gumball").
** In the first season, Mr. Small, Tobias, Banana Joe, and Alan were all played by Rupert Degas while Ms. Simian was voiced by Sandra Searles Dickinson. From season two on, Mr. Small is now voiced by Adam Long while Hugo Harold-Harrison voices Ms. Simian, Tobias, Banana Joe, and Alan (though Dickinson still voices Granny Jojo and other female characters).
** Tina also changed from Dan Russell to Stefan Ashton Frank, even though Russell continues to play all his other roles (including Richard).
** Both Gumball and Darwin were recast in season three from Logan Grove and Kwesi Boakye to Jacob Hopkins and Terrell Ransom, Jr. respectively due to their original voice actors hitting puberty. The season three premiere "The Kids" is both a farewell to Grove and Boakye and an introduction to Hopkins and Ransom, Jr.
** In season 1, Sussie (the chin puppet) was voiced by the creator's girlfriend Aurelie Charbonnier but in season 2 she is replaced by British comedian Fergus Craig. Charbonnier, however, still plays the physical puppet, just with Craig's voice dubbed over.
** Almost all voices were recast in the Hungarian version after season 1, save Gumball, Darwin, Nicole, Anais and a few side characters. Season 3 changed even more voices, including Gumball's and Nicole's. Now Darwin, Anais, Banana Joe, and Penny are the only characters with their original voices.
* PropRecycling: A lot of the characters are rejected advertising mascots Ben Bocquelet had in his portfolio.
* ShortRunInPeru: Several episodes have aired first in Brazil (Portuguese dub), France, Spain, Central and South America (still in English), and Australia.
* TalkingToHimself: Most of the dozen plus named students in Elmore Junior High are voiced by a few people, so this happens a lot. In particular, every non-adult female save for Anais, Tina, Sussie, and (from the second season onward) Carmen is voiced by either Teresa Gallagher or Jessica [=McDonald=].
* TheWikiRule: [[http://theamazingworldofgumball.wikia.com The Amazing World of Gumball Wiki]]
* UnfinishedEpisode: Four episodes [[https://twitter.com/benbocquelet/status/247455074387886081 were scrapped]] in the first season: two were called "The Mom" and "The Pizza", the other two weren't named yet. Season two also had an episode planned called "The Rex" which was [[https://twitter.com/benbocquelet/status/397840050152804352 cut because it would have gone over budget.]] However, the premise for the two named episodes may or may not have been for the season three episodes "The Mothers" and "The Pizza". "The Rex," which would have fully introduced Tina's father and have been a parody/homage to ''Jurassic Park'', has, so far, been scrapped.
* WhatCouldHaveBeen:
** Most of the characters of this show were originally going to be mascots for ads and company logos, but all of them were rejected. Rather than get rid of them, Ben Bocquelet superimposed them on a photograph of a school and decided to create a series out of it.
** In [[http://issuu.com/worldscreen/docs/tv_kids_mipcom_2013 an interview (page 127)]], Ben Bocquelet revealed that the show was originally pitched as an AdultSwim show and about rejected cartoon characters in a remedial school. Cartoon Network found the idea to be too depressing and Bocquelet changed it focus more on Gumball and his family and make it more like a daytime Cartoon Network show (though, like most CartoonNetwork shows, it has the dodgy humor of an Adult Swim show, despite carrying a TV-Y7 rating).
** [[http://polyminthe.blogspot.com/2012/06/amazing-world-of-gumball-development.html At some point in development]], Richard was a skinny blue dog while Gumball was a black cat instead of a blue one.
** An "Early Reel" was made for the show as a pilot. The most noticeable differences are the fact Darwin was animated in CGI and Gumball had a square head, though other characters looked different too. Teri was also a boy, there.
** The people in "The Sweaters" from Richwood High [[http://theamazingworldofgumball.wikia.com/wiki/The_Sweaters/Gallery#Miscellaneous were originally going to be]] {{Funny Animal}}s like everyone else, rather than stiffly animated 70s/80s-cartoon-style humans.
** Sarah G. Lato's name was originally going to be [[http://theamazingworldofgumball.wikia.com/wiki/File:GB200_DOLLY_ORIGINAL_PUPPET.jpg Dolly]].
* WriteWhatYouKnow: The turtle drying out in "The Puppy" when Darwin leaves him in the sun is based on how the pet turtle of the series creator died.
* WriteWhoYouKnow: Ben Bocquelet [[https://www.youtube.com/watch?feature=player_detailpage&v=Swxzs2NRpDI#t=130 has described]] Richard, Nicole, and Anais as caricatured versions of his family members that they're named after and Gumball as being based on his perception, as an adult, of what he was like as a kid.
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