* AccidentallyAccurate: In the "Petting Zoo" short, Octavia the eight-legged cow [[http://scienceblogs.com/tetrapodzoology/2010/12/20/carnivory-in-cows-and-deer/ kills and eats a bird]].
* ActorAllusion:
** Creator/BrianBloom is no stranger to voicing characters in ''Street Fighter''-type fighting games; he played Comicbook/CaptainAmerica in ''VideoGame/MarvelVsCapcom3''.
** This isn't the first time Creator/JeffBennett voiced a [[JustForFun/CandleJack super creepy character]].
** [[Music/{{NSYNC}} Lance Bass]] knows a thing or two about being in boy bands. One of the clones even does *NSYNC's signature "Bye Bye Bye" move.
* ChannelHop: Season 2's episodes and onwards will premiere on Creator/DisneyXD.
* CreatorCameo:
** Alex Hirsch voices both Grunkle Stan and Soos.
*** As well as Old Man [=McGucket=], Quentin Trembley, the gnomes, several of the members of Sev'ral Timez and Bill Cipher.
** The creative director Michael Rianda voices Mr. Poolcheck.
* CrossDressingVoices: Grenda is voiced by Carl Faruolo.
** Grunkle Stan also momentarily sounds like a woman after accidentally drinking voice-altering tonic.
* FanCommunityNickname: Tumblr Fans of the show are called Fallers.
* HeyItsThatVoice: [[HeyItsThatVoice/GravityFalls Has its own page now]]!
* IKnewIt: [[spoiler:Stan has Book 1.]]
* ManOfAThousandVoices: Alex Hirsch voices at least five different characters in the show, and they all have their own distinct voice.
** More specifically, he voices: Stan, Soos, Jeff, Bill Cipher, Quentin Trembley, Old Man [=McGucket=], Norman, Paper Jam Dipper, and additional background characters.
** Music/GreyDeLisle also voices many incidental characters on the show, some of the most notable being Mrs. Gleeful in "Little Dipper," the Summerween Superstore clerk and Gorney in "Summerween," Grunkle Stan's new voice in "Bottomless Pit," and the woman who asks Soos for directions and ends up falling in love with him in "Carpet Diem."
* NamesTheSame: The Lamby Lamby Dance in the episode, "The Inconveniencing", has the same name as a certain toy lamb in ''WesternAnimation/DocMcStuffins'' another DisneyChannel show.
* OneOfUs: Someone working on the show is madly in love with StreetFighter. And VideoGame/SuperMarioBros2. And PacMan.
* TheOtherDarrin: Strangely enough, in a commercial for Gravity Falls mealbags at Subway, Kristen Schaal does not voice Mabel. Even stranger, all of the dialogue for the twins in that trailer is taken from clips of previous episodes, and they didn't dub over Jason Ritter's voice for Dipper. Maybe Kristen Schaal just doesn't like Subway.
** Creator/NathanFillion voices Preston Northwest in season 2 while another actor voiced him in "Irrationnal Treasure".
* PromotedFanboy: Emmy Cicierega (sister of Creator/NeilCicierega), who has done [[http://emmyc.tumblr.com/tagged/gravity-falls fanart]] for the show, [[https://twitter.com/EmmyCic/status/418164421564055552 now works on the show as a storyboard artist.]]
* RelationshipVoiceActor:
** A good amount of the cast is basically a mini ''WesternAnimation/AdventureTime'' reunion: Candy is BMO and Lady Rainicorn, Mabel is Jake Jr., Blandin is Lemongrab, Pacifica is Susan Strong, Tambry is Flame Princess, [[Creator/JohnDiMaggio Manly Dan]] is Jake, [[Creator/JeffBennett the Summerween Trickster]] is Choose Goose, and [[Creator/DeeBradleyBaker Waddles]] is Cinnamon Bun.
* ScheduleSlip: For some unexplained reason there are a lot of long delays between episodes in the US.
* TalkingToHimself: Grunkle Stan and Soos.
** Literally in the episode "Double Dipper" with Dipper and all his clones.
* UrbanLegendOfZelda: There is a picture circulating the Internet of [[Franchise/TheSlenderManMythos the Slender Man]] watching Dipper and Mabel from the background in one of the episodes. This is not the case; viewing the episode itself yields no Slender Man.
* WhatCouldHaveBeen:
** [[http://superpunch.blogspot.com/2012/06/gravity-falls-concept-art.html The early concept art]] shows several possible designs for the characters.
** Creator/NeilCicierega composed [[http://neilcicierega.tumblr.com/tagged/gravity-falls two unused themes]] for the show.
** There was going to be an episode based on the David Bowie film Film/{{Labyrinth}}. Mabel would love the movie, but Dipper would hate it due to a fear of puppets. Dipper wouldn't admit to being afraid of the puppet; he would just call the movie dumb. Mabel would summon the Goblins to take Dipper away so she could watch the film. The Goblins would come out of the film take Dipper to the Labyrinth. [[{{David Bowie}} The Goblin King]] would try to get Mabel to go through the labyrinth to find Dipper, but Mabel would instead want to spend time with the Goblin King. The episode would end with Dipper admitting his fear of puppets. [[{{ExecutiveMeddling}} The episode wasn't made because the studio execs]] [[{{ViewersAreMorons}} didn't think the audence would get the reference.]]
** Alex Hirsch wanted Creator/BobOdenkirk to play Stan but [[https://twitter.com/_AlexHirsch/status/373275648136998912 he turned the offer down.]]
* WordOfGod: Alex Hirsch, the series creator, frequently answers fan questions on his [[https://twitter.com/_AlexHirsch Twitter feed]].
** Wendy's last name is Corduroy.
** Dipper and Mabel's eyes are brown (despite being shown as green in "The Inconviniencing") and Li'l Gideon's are blue.
*** Only Mabel is shown with green eyes; it's implied to be a result of overdosing on Smile Dip.
** Mabel is the older of the twins by 5 minutes.
** Hirsch describes the show as ''TwinPeaks'' meets ''TheSimpsons''
* WriteWhatYouKnow: Alex Hirsch based the series on the childhood summers he and his twin sister spent camping with their great-aunt.
* WriteWhoYouKnow: Dipper is based on Alex Hirsch himself and each of the other main characters on people he knows. Mabel is based on Hirsch's twin sister Ariel, Grunkle Stan on their Grandpa Stan, Soos on Hirsch's one-time roommate Jesus and Wendy on a girl he had a crush on in his youth (rumored to be Creator/LaurenFaust).
** Wendy's list of ex-boyfriends [[http://ariel-is-mabel.tumblr.com/post/41441015383/instead-of-doing-ask-ariel-today-im-doing uses the names of real people]] Ariel Hirsch had crushes on
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