* CreatorBacklash
** Creator/LaurenFaust has made it abundantly clear that she is not at all proud for writing "Everyone Knows It's Bendy."
** Creator/TaraStrong has said that Terrence was her least favorite character to play, as his raspy voice made her go hoarse with each appearance.
* CreatorsFavoriteEpisode: Mac's voice actor Sean Marquette cites "Partying is Such Sweet Soiree" as his favorite episode, specifying that he really enjoyed getting to perform the role of Mac while his character was running around screaming like a maniac from his sugar high.
* CrossDressingVoices:
** Terrence is voiced by Creator/TaraStrong.
** Cheese is voiced by Creator/CandiMilo, who also voices Madame Foster and Coco. And [[WesternAnimation/ChalkZone that other blue dude.]]
** In the Japanese-language dub of the show, Mac is voiced by Makoto Tsumura, who voiced Anime/AstroBoy in the 2003 adaptation. [[Anime/DigimonTamers She also voiced an adorable young boy who created his best friend]] (and if counting other Japanese dubs of American cartoons, [[WesternAnimation/ChalkZone two of them!]])
* DawsonCasting: Eight-year-old Mac is voiced Sean Marquette, who was about fifteen or sixteen when the show began. He was not replaced after he had gone through puberty. Instead, he had his voice digitally pitched up. It is obvious if one compares episodes from Season 1 to episodes afterward.
* ExecutiveMeddling: A minor example, but ''the'' reason why "Everyone Knows It's Bendy" ended up being such a disappointment to the writing staff. Before the episode was finished, Cartoon Network insisted that the series switch from half-hour to quarter-hour hour shows and the result was that several key story moments, which would have ended in Bendy and Bloo getting what they respectively deserved, had to be dropped.
* FakeBrit: Kansas native Tom Kane as Mr. Herriman, who has a British accent even if he probably isn't actually British. He mostly pulls it off, but certain pronunciations may give the game away.
* FollowTheLeader: While not the first TV series to use AdobeFlash for its animation, it was arguably the first to push its limitations to better suit the looser appearance of traditional character designs instead of the blocky, geometric look often used to make Flash animation easier, and has clearly had an influence on television fully embracing the medium over the following decade in shows like ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' and ''WesternAnimation/MotorCity''.
* InspirationForTheWork: The inspiration for the show [[https://twitter.com/CrackMcCraigen/status/610248929213464576 came from]] when Craig [=McCracken=] and Lauren Faust adopted three dogs from an animal shelter, and wondered what their lives were like before.
* OutOfOrder: The episodes on the first season DVD set are listed differently than how CN aired them, as they go from production order. This makes sense as "Busted" feels like it takes place after "House of Bloo's".
* TalkingToHimself: Among the main and secondary cast, Creator/GreyDeLisle plays Frankie, Goo, and Duchess while Creator/CandiMilo is Coco, Madam Foster, and Cheese. The voice actors for the main cast besides Mac's also tend to provide most of the voices for {{One Shot Character}}s and the show's many {{Recurring Extra}}s.
* {{Tuckerization}}: Jackie Khones's name is a {{Spoonerism}} of Executive Producer Khaki Jones.
* WhatCouldHaveBeen: In the earliest sketches of the show, Mac was blond and had shorter hair.
** [[http://cmcc.deviantart.com/art/Eduardo-Development-76338423 See]] [[http://cmcc.deviantart.com/art/Coco-Development-76338828 some]] [[http://cmcc.deviantart.com/art/Frankie-Deveopment-76339145 concept art]] [[http://cmcc.deviantart.com/art/Bloo-Development-76337898 from]] [[http://cmcc.deviantart.com/art/Wilt-Development-76338091 Craig [=McCracken=]'s]] [[http://cmcc.deviantart.com/art/Mac-Development-76337605 Deviantart here.]]
** A character originally conceived for the show was an imaginary friend who was created from the acid trip of a college student. However, Craig [=McCracken=] had no idea [[GettingCrapPastTheRadar how to convey it subtly]] before realizing he ''didn't want to know'' what kinds of imaginary friends an adult could create, hence the rule that only children can make imaginary friends.
* WordOfGod: Years after the show ended, the show's creator provided numerous odd bits of information on Twitter:
** [[https://twitter.com/CrackMcCraigen/status/611928065912868867 Only children could make imaginary friends]], then this ability [[GrowingUpSucks is lost]] [[InvertedTrope upon completing]] [[PubertySuperpower puberty]]. Terrence was able to make one because he wasn't fully post-pubescent then.
** [[https://twitter.com/CrackMcCraigen/status/612061383434219520 Both of Frankie's parents are alive.]] Having to grow up with Mr. Herriman around [[https://twitter.com/CrackMcCraigen/status/609812747715350528 soured Frankie's dad on the idea of imaginary friends]], so he [[https://twitter.com/CrackMcCraigen/status/609813042860142592 never let Frankie have one]]. The only one she ever made [[https://twitter.com/CrackMcCraigen/status/609817339400355840 she had to give up]], and one of the reasons she works at Foster's [[https://twitter.com/CrackMcCraigen/status/609817724760408064 is so she might see that friend again some day]].
** The CityWithNoName the show it set in is located [[https://twitter.com/CrackMcCraigen/status/609737072014790657 somewhere in the Pacific Northwest]].
* WriteWhoYouKnow: Frankie is based on Craig [=McCracken=]'s wife and series writer Creator/LaurenFaust. He denies that Mac was based on himself, but seeing as Mac has a crush on Frankie, Craig eventually decided to roll with it. The concept came to him when he and Lauren adopted a puppy and Craig made up a story about what his life was like before they got him.