!The Book and TV Special
* {{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]].
** Others have argued that the message itself ''is'' actually subtle when compared to other GreenAesop[=s=] - or at least it was for the time.
*** And AnAesop that went overlooked was 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.
* StrawmanHasAPoint: In the TV special, the Once-Ler says that he can't just shut down the plant and lay off ten thousand workers because it's bad for the economy. Even the Lorax admits he has a point here.
* TearJerker: Any of the reprises played during the exoduses of the Barbaloots, Swamy-swams, Hummingfish and Once-Lers. Also the song Once-Ler sings when he's analyzing himself, guilty of what he's done and personally ashamed to be a Once-Ler.
* 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.
** Even the Once-Ler is pitiable in the end, left alone in the ruins that he essentially created.

!The Film
* {{Anvilicious}}: Particularly the musical numbers. Critics point out that the above StrawmanHasAPoint scene is not there.
* 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.
* CrowningMomentOfHeartwarming:
** ''"Let It Grow"'' the finale, especially when [[spoiler:Ted gets his kiss from Audrey.]]
** In the end, [[spoiler:Old Once-Ler's reunion with the Lorax after truffula saplings begin to grow back, complete with a hug between old friends]].
* CrowningMusicOfAwesome:
** [[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...]]
* DracoInLeatherPants: The evil version of Once-Ler.
** Although he's an AntiVillain who makes a HeelFaceTurn, so he's not as bad as some of the other examples.
* EarWorm: "How Bad Can I Be?" and "Let It Grow (Celebrate The World)".
** "Thneedville" should also come to mind.
* EnsembleDarkhorse: Once-ler is pretty popular as it is, but [[JumpingOffTheSlipperySlope evil]] Once-ler was only on screen for a few minutes (his VillainSong and the scene that followed it) and yet he's gotten a ''ton'' of fanart.
* EstrogenBrigade: Younger Once-ler attracts A LOT of this. To the point that he has become a fandom of his own.
* FanNickname: The Greed-ler, for the Once-ler after his FaceHeelTurn.
* {{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.
* 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.
* "FunnyAneurysm" Moment: 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.
* 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?]]
* InternetBackdraft: Fans of the 1972 TV special are quite critical about the movie.
* LoveItOrHateIt: Critics are generally split right down the middle when it comes to their opinions on this film.
** CriticalDissonance: General audiences mostly seem to like it fine, though.
* MemeticMutation: "''Dat's'' a woman??" Helped in no small way to aaaaaaaaaaall the trailers including this line!
* MisaimedMarketing:
** Mazda using the Lorax, with all its [[GreenAesop Green Aesops]], to shill their gas-guzzling, pollution-spewing [=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 this runs somewhat counter to the message of The Lorax.
** Universal is treating this film like any other major Hollywood animated blockbuster, by giving it 70+ tie-ins with products, immense marketing strategies, and celebrity voices. What most people don't seem to get is that the message of the book is that it's ''WRONG'' to buy into excessive "Thneeds" that harm the environment!
** In general, the kids are sucked in towards the cute animals, despite the fact that they appear only in flashbacks and are evicted out due to destruction of their habitat.
* {{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.
** Though you have to wonder how he didn't see the huge waterfall or know of its existence, [[FridgeLogic since he knows the forests so so well...]]
* NightmareFuel:
** Old Man Once-ler when he's first seen peering through the window and ''reaching out'' at Ted, but he just 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?'''
** 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 a few THINGS 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.
* RomanticPlotTumor: Some find the Ted and Audrey subplot as this. Ted's {{character development}} that eventually made him ''actually'' care about trees however, seemed to make some people forget about his original motivations in finding a real tree in the first place, so this is somewhat {{zig-zagged}}.
* 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.
* TearJerker:
** The last Truffula tree falling.
** "Unless".
* 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 point of the original was to say that the [[MeaningfulName Once-ler]] was only interested in making a profit once, teaching viewers a lesson about renewable resources.
*** It was kind of painstakingly obvious that if you cut down all trees without planting new seeds, no more profit, which is just StupidEvil from Once-ler's family's part, and Once-Ler's ExtremeDoormat preventing him from saying anything about it. The film makers probably didn't want to make it so Anvilcious and avoid ViewersAreMorons, letting logic thinking do its work.
** Another example is 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.
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