* AuthorExistenceFailure:
** For Latin American viewers, this movie could be hard to watch if you know that Carl's Mexican voice actor (Tito Resendiz) died a few months later after dubbing this movie to Spanish.
** Now the same can be said for the Brazilian viewers, with the recent death of comedy legend, Chico Anysio.
* {{Defictionalization}}:
** Though it lacks the balloons and has a basement, someone built a real-life copy of Carl and Ellie's house, complete with a painting over the fireplace. [[http://www.sltrib.com/sltrib/home2/52141049-183/bangerter-disney-movie-parade.html.csp In Herriman, Utah]].
** Still, a group of people actually ''did'' manage to float a house using helium-filled balloons -- appropriately enough, for a TV show called ''How Hard Can It Be?''
* EasterEgg: On the main menu of the UK Blu-ray (and other releases), pressing the Left arrow on your remote control reveals "The Egg", a short piece in which the film makers discuss the abandoned plans to make [[spoiler:Kevin's eggs]] into the elixir of youth.
* HeyItsThatVoice:
** With EdAsner playing Carl Fredricksen (and for once not [[InkSuitActor Ed Asner]]), some people have been calling ''Up'' "[[{{WesternAnimation/Freakazoid}} Cosgrove]]: TheMovie"
** Also, Charles Muntz is both [[WesternAnimation/AnAmericanTail Henri]] and [[WesternAnimation/RockADoodle The Grand Duke of Owls]].
** Bob Peterson, who voices Dug and Alpha, also voiced Roz and Mr. Ray from ''WesternAnimation/MonstersInc'' and ''WesternAnimation/FindingNemo'', respectively. He's also the co-director of ''Up'', and has written for several Pixar films.
** You may also recognize the Newsreel announcer as [[DavidKaye the one from commercial for Enzyte]]. Also known as [[WesternAnimation/BeastWars a certain Megatron, yeeeeeeeesss.]]
** [[spoiler:Kevin's babies]] are voiced by Creator/FrankWelker.
** The skinny Shady Oaks nurse is [[Film/BackToTheFuture Mayor Goldie Wilson.]]
** Watch the French dub. Singer Charles Aznavour is Carl.
** The Japanese dub is a reunion of many protagonists from the Franchise/{{Gundam}} franchise:
*** [[ShozoIizuka Carl is]] [[Anime/MobileSuitGundam Ryu Jose]] and [[VideoGame/SuperRobotWars Bian Zoldark]].
*** [[TamakiMatsumoto Young Ellie is]] [[Anime/CodeGeass the Tianzi]].
*** [[YasunoriMatsumoto Dug is]] [[{{Slayers}} Gourry Gabriev]] and [[Anime/MobileSuitGundam00 Alejandro Corner]].
*** [[Creator/WataruTakagi Gamma is]] [[Anime/AfterWarGundamX Garrod Ran]], [[GreatTeacherOnizuka Eikichi Onizuka]] and [[VideoGame/StreetFighterIII Hugo]].
*** [[TomoyukiDan Beta is]] [[Anime/MobileSuitVictoryGundam Chronicle Asher]], [[Manga/{{Naruto}} Kisame Hoshigaki]] and [[Film/TheDarkKnightSaga Batman]].
*** [[HochuOtsuka Alpha is]] [[Anime/MobileSuitZetaGundam Yazan Gable]], [[Anime/MobileFighterGGundam Chibodee Crocket]] and [[Manga/{{Naruto}} Jiraiya]].
** In Brazil, Carl was voiced by famous brazilian comedian [[http://pt.wikipedia.org/wiki/Chico_Anysio Chico Anysio]] and Dug was voiced by his (Chico's) son [[http://pt.wikipedia.org/wiki/Nizo_Neto Nizo Neto]].
* SimilarlyNamedWorks: ''Up'' shares it's name with a {{Peter Gabriel}} album and a {{Right Said Fred}} album.
* ThrowItIn: The "That's not gonna work" gag started out as a joke ending to an early version of a scene, where Carl really ''did'' try to get Russell out of the house on a rope. They kept it.
* WhatCouldHaveBeen
** See EasterEgg above. Scrapped due to teetering into a sudden genre shift to horror.
** The original opening involved young Ellie and Carl constantly out to punch each other due to a childish rivalry until they fall in love in their teen years. Then, one of Ellie's last acts in her hospital bed is to throw Carl an affectionate punch in the chest. Needless to say, Pete Docter said he got funny looks from test viewers.
** Initially Carl would make a balloon animal of Kevin to lure Muntz into its labyrinth home, then abandon him there. This piece of AlasPoorVillain was done away with due to Pete Docter feeling that it made the ending more about Muntz than Carl and Ellie.
** Other endings were considered, including one where [[HeelFaceTurn Muntz would redeem himself]] after talking to Carl; one where he got his foot tangled in the balloons and was pulled up into the air; and one where he ran into the house to grab what he thought was Kevin (actually just another balloon) and was followed by his dogs, their combined weight causing the house to fall.
** Kevin was originally introduced with Carl and Russell finding her in one of Muntz's traps and freeing her. Then Docter realized it wouldn't make much sense after she'd been dodging his traps for decades.
* TropeNamer:
** ConeOfShame
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