!!The Book and TV Special
* AlternateAesopInterpretation:
** ''Sustainable'' logging, rather than no logging whatsoever. Had The Once-Ler planted one new Truffula tree for every tree he cut down (i.e. deforestation plus mass ''re''forestation instead of only deforestation), the environmental impact would have been greatly reduced. If nothing else, the Once-Ler's company wouldn't have run out of trees to cut down.
** The fate of the town in the TV Special - once the Truffula trees were gone, they picked up and moved to brighter pastures, as any GhostTown in the Western US[[note]]Established during the Gold Rush in the 1800s[[/note]] can attest to being TruthInTelevision.
* {{Anvilicious}}: The book is constantly telling you the importance of nature. Although, that is very much the point. To many, [[SomeAnvilsNeedToBeDropped this is part of its charm]].
* FairForItsDay: Others have argued that the message itself ''is'' actually subtle when compared to other GreenAesop[=s=] - or at least it was for the time.
* NightmareFuel: "Good Ol' Onceler", a song in praise of everything the Once-Ler has created which the man himself ends up applauding as "very heartwarming", is... disturbing in its naked dedication to a self-aggrandizing corporate empire.
* TheWoobie: The titular Lorax REALLY gets put through the wringer, and you'd want to give the poor guy a hug after seeing his home destroyed and his friends cast out of what was once their own home.

!!The Film
* {{Anvilicious}}: Just like the book was, particularly the musical numbers. In fact, many actually consider it to be even worse because it neglects the subtlety and StrawmanHasAPoint moments from the original book and special.
* SugarWiki/AwesomeMusic:
** [[http://www.youtube.com/watch?v=0frZxH_asqM How ba-ah-ah-ad can I be?]]
** John Powell's orchestral work on the score is spectacular as usual.
** [[http://www.myspace.com/music/player?sid=86644319&ac=now At first I didn't realize I needed all this stuff...]]
** [[https://www.youtube.com/watch?v=Slpz0D35oRI You don't know me, but my name's Cy...]]
* CriticalDissonance: Critics are split down the middle, and fans of the original book aren't crazy about it, but general audiences mostly seem to like it fine.
* CrossoverShip: The Once-ler seems to have become the patron saint of this trope. Go to any movie's YMMV page that lists crossover ships, and it will likely list the Once-ler paired with whoever's in the movie.
* DoNotDoThisCoolThing: It's difficult not to want to be in the Once-ler's shoes during "How Bad Can I Be". Though he's brought back to earth ''hard'' in the following scene.
* DracoInLeatherPants: The Onceler.Despite cutting down all the trees to make his thneed, The Onceler is one of the film's most popular characters, thanks in part to his depiction in the film.
* EarWorm:
** "How Bad Can I Be?" and "Let It Grow (Celebrate The World)".
** Even a few people who don't like this movie have admitted that "Thneedville" is pretty awesome.
* EnsembleDarkHorse: Cy the Delivery Guy has started to get this treatment after the movie became a meme.
* EstrogenBrigade: Younger Once-ler attracts A LOT of this. To the point that he has become a fandom of his own.
* FandomBerserkButton: For purist Seuss fans, this whole movie is one, from the above-mentioned [[AdaptationalAttractiveness "hotter" and too-sympathetic Onceler]], as well as his FreudianExcuse, to the copious amounts of padding (the actual story from the book only lasts about fifteen minutes!) and gags, especially the ones involving the [[RidiculouslyCuteCritter animals]], the kicker being the HateSink character Mr. O'Hare, which disobeys Dr. Seuss's [[HeelFaceTurn standards about comeuppance]].
* {{Fanon}}:
** In the case of Ted's mom, some have christened her as "Helen", named after Dr. Seuss' first wife, as in a similar fashion how Ted and Audrey's names were based off of.
** The Once-ler's mother's name being Isabella. But the funny thing is, ''nobody'' knows how that name came to be or where it even came from but [[SureLetsGoWithThat many decided to use it]] when referring to her in fanfics or in general.
** How Ted's grandmother came to know the Once-ler in the first place (well, enough to know he's probably on the outskirts of town). Some fashion that they had a romantic relationship throughout his journey into becoming the CorruptCorporateExecutive he turns into in the end.
* FixFic: The amount of time devoted to things that weren't part of the source material, the way a large portion of the original story was abridged into a single song sequence, and the fully resolved happy ending in place of a thought-provoking question-mark ending make it like one to an extent.
* FunnyAneurysmMoment: All those cute scenes of the Once-ler interacting with the animals are considerably less heartwarming knowing what he ends up doing to all of them.
* HarsherInHindsight: Thneedville's pollution levels being so high that the citizens need to buy contained air to breathe [[http://thenewdaily.com.au/news/2015/12/22/chinas-airpocalypse-forces-people-buy-air-can/ is now a reality in China]].
* HilariousInHindsight:
** Those MisaimedMarketing deals down below that make the Lorax into a product mascot? The film mirrors this in one scene where the paparazzi takes a photo of the Lorax accidentally holding a Thneed, then posting on an ad now claiming Thneeds are "Lorax approved".
** That 'Let It Grow' song...[[Disney/{{Frozen}} does it remind you of anything?]]
** Aloysius O'Hare made his fortune by literally selling bottled fresh air to the polluted Thneedville. [[http://www.telegraph.co.uk/news/worldnews/asia/china/12051354/Chinese-buy-up-bottles-of-fresh-air-from-Canada.html Well...]]
** In the Japanese dub, Taylor is voiced by Creator/MamoruMiyano. So Miyano got to voice Zac Efron's role after Zac failed to get [[Manga/DeathNote one of Miyano's biggest roles?]] [[note]] Though rumor has it that Zac turned down the part saying something along the lines of "cast Asian actors for Asian characters," avoiding a RaceLift.[[/note]]
* JustHereForGodzilla: The Onceler, whose fans basically turned into a fandom of their own separate from the general film.
* LoveItOrHateIt: Critics are generally split right down the middle when it comes to their opinions on this film.
* MemeticMutation:
** Doubles as TrailerJokeDecay: "That's a woman?"
** The Songs "Let it Grow", in a similar vein to [[Series/LazyTown "We Are Number One"]], had become a meme on YouTube.
** To a lesser extent, "How Bad Can I Be?" and "Thneedville".
** "And me, I'll take care of [[Series/LazyTown mine mine mine mine mine!]]"
** "Hi Security, we have some adorable intruders. [[SuddenlyShouting Who are trespassing!]] You're all going to jail!"
** "YOU GREEDY DIRTBAG!"
** "GO ON, tell 'em what you think!"
** "Nah, ha-ha, I say let it DIE! Let it die, let it die, let it shrivel up and--come on, who's with me, huh?"
** "Whatever you do, don't Google Granny Norma!"[[labelnote:Explanation]]Many viewers [[{{Mondegreen}} misheard]] Grammy Norma's name as "Granny Norma." That also happens to be the stage name of an elderly pornographic actress who still appears in films. Needless to say, quite a few people were {{squick}}ed out when attempting to search for the character. This warning often appears in the comments sections of clips from the movie featuring Grammy Norma.[[/labelnote]]
* MisaimedMarketing:
** Mazda using the Lorax, with all its {{green aesop}}s, to shill their ''not'' eco-friendly [=SUVs=] in [[https://www.youtube.com/watch?v=e9VthuI30JI this commercial]].
** Also promoting the movie is the typical host of theater paraphernalia... including putting the film's logo on disposable paper popcorn holders. Again, it does not take a genius to ascertain why [[BrokenAesop this runs somewhat counter to the film's message]].
* {{Misblamed}}: A number of viewers and critics accused the Lorax of trying to kill Once-ler by sending him afloat the river on his bed... despite the fact that it was a freak accident from a sleeping Once-ler that put his life in jeopardy (his leg accidentally steers the bed down the wrong stream, toward a waterfall), and the Lorax outright ''says'' after he saves Once-ler that he ''didn't'' want him dead, just to "harmlessly drift away downstream". If he had really wanted Once-Ler dead, he probably wouldn't have used a pair of bar-ba-loots as a MagicalDefibrillator.
* NightmareFuel:
** Old Man Once-ler when he's first seen peering through the window and ''reaching out'' at Ted, but he gets less scary from there.
** Also, "How Bad Can I Be" is pretty fun and upbeat for a VillainSong...until the very end, which has a giant Once-ler looming over the entire forest which he is destroying, giving a SlasherSmile after shouting the last lyrics "HOW BAD COULD THIS POSSIBLY BEEEEEE?"
-->Once-ler: '''WHO CARES IF A FEW TREES ARE DYING?'''
*** At the start of the song, it's phrased like a legitimate question, but by the end, it almost seems like a ''challenge''.
** If you think that's scary, listen to its DarkReprise, [[https://www.youtube.com/watch?v=BpgUQYARIsw Biggering]] (complete with storyboard to tickle your imagination). There was a reason it was cut from the film.
--> '''Once-ler:''' "Who cares if some thing are DYING? '''I DON'T WANT TO HEAR YOUR CRYING!'''"
** Ted nearly [[OffWithHisHead having his head cut off]] after running into that abandoned super-axe-hacker.
** Even though he's a FlatCharacter, O'Hare was able to ''[[BigBrotherIsWatching spy on everyone]]'', and ''no one'' seemed to notice.
* RomanticPlotTumor: Some find the Ted and Audrey subplot as this.
* TheScrappy: O'Hare to some, both for being an unnecessary addition to the story and for being such a one-dimensional villain. Also, his design falls a bit into the Uncanny Valley. If this film was going to have a villain, couldn't it be one with charisma?
* TastesLikeDiabetes: Its more "lighthearted" moments which are subjected to overly cheerful song and dance numbers are this, most likely in the very beginning and very end. Its bright, colorful visuals don't help either. And completely caramelized when little 3-year old Marie suddenly started singing.
* TheyWastedAPerfectlyGoodCharacter:
** Characters, plural. The Once-Ler's family actually made far more interesting villains than O'Hare being naturally un-supportive, greedy, and manipulative. Wouldn't it have been better for more of the conflict to show ''them'' how destroying nature is a bad thing and along the way, maybe reconcile with his family?
* WhatAnIdiot:
** Maybe the Once-Ler could have told his greedy family that harvesting Truffula leaves by clearing cutting the forest is as ridiculously self-destructive a business practice as an apple farmer harvesting by chopping down his orchard. Or if he just planted as many seeds as trees he cut down this would have never happened. Or the fact he didn't set his entire business around a single product from a limited resource.
** The aforementioned Mis-blamed. If the Lorax wanted the Once-ler to float harmlessly down the stream, he should have placed him further down the stream, away from the waterfall turnoff, so there wouldn't be the possibility of him turning down into danger. The turnoff wasn't that far away from where he was placed, and a large roaring waterfall is hard to miss.
* TheWoobie: The Once-ler. His family and the townspeople mock him at first, his greed and years of success are glanced over and he ends up spending the majority of his life as a forgotten, guilt-ridden hermit. Had they shown more of his bad side, his punishment wouldn't seem so unjustifiably extreme.
* WTHCastingAgency: Many find Zac Efron's role as Ted to be this, as he is an adult man voicing a teenaged boy. Taylor Swift's role also sometimes gets this, but to a lesser degree.
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