* AssPull: The Timmy Turner Loophole, for some. [[spoiler: Basically, it was created so that Timmy would be allowed to keep his Fairy Godparents even after growing up.]] Even if it was justified [[spoiler: in that Fairy World does owe Timmy big time for saving them on more than one occasion]], it still came out of left field [[ShaggyDogStory and undermined the point of the special, which was to have Timmy grow up.]]
* BrokenBase:
** Cosmo and Wanda's CG designs. Some don't mind them, but others would've preferred them done in the show's old style, or anything if they flat-out ''hate'' the CG.
** Before the movie even aired, many fans reacted in sheer disbelief if not anger. Now that it has aired, some think [[ContestedSequel it's flat-out awful]], and some fans [[SurprisinglyImprovedSequel enjoyed it]].
** The sequels was even more broken. Many saw there being no reason for ''other'' movies.
** Tootie's adult design has torn up the fanbases, especially Tootie fans.
* EarWorm: "Lookin' Like Magic"
* FanonDiscontinuity: Some fans won't acknowledge it.
* HoYay: Between Crocker and Magnate.
* MoralEventHorizon: Magnate [[spoiler: trapping Tootie in a cage and using a remote control to ''zap'' Cosmo, Wanda and Poof and drain their energy]] is bad enough, but [[FromBadToWorse it gets worse]] when he [[spoiler: wishes for a bottomless ball pit that he wishes a random mook and Mr. Crocker down.]]
* NightmareFuel: Hugh J. Magnate's [[spoiler: creepily smiling and giggling evil rabbit]]
* OneSceneWonder:
** Jason Alexander and Cheryl Hines as human Cosmo and Wanda, much to the disappointment of many who felt they were much better than the CGI fairies with their TV voices that were used through most of the film.
** [[BabysitterFromHell Vicky's]] scenes.
* ShipToShipCombat:
** A large percentage of the people complaining and prejudging this movie are simply angered fans of other love interests such as Trixie, Vicky, or Veronica. This is not helped by the fact that the movie makes a point to establish that [[spoiler: [[NegativeContinuity all other prior romantic moments on the show, besides Timmy being kissed by Tootie against his will, simply did not happen, and that Timmy has never truly loved any other girl.]] ]]
** A [[http://www.nick.com/quizzes/grow-up-timmy-turner-quizzes/one-wish-quiz.html character match-up quiz]] on the official Nickelodeon website strongly suggests that Tootie was the mystery mother of Timmy's children at the end of Channel Chasers, adding gasoline to an already white hot fiery debate, or perhaps dousing it with a splash of cold water, although some people just prefer not to think of this movie as the real ending to the series, as well as not taking the quiz seriously since this isn't Butch Hartman himself saying it.
* {{Squick}}: A twenty three year old man acting like a child, even if it is [[spoiler: an act to keep beloved fairy godparents]] is kind of creepy. It becomes even ''more'' creepy when you realize that this ManChild is likely sharing a locker room and bathrooms with [[FridgeHorror other ten year old boys]]
* TaintedByThePreview: There are fans who really dislike the idea of making a traditional ThickLineAnimation series into a LiveActionAdaptation. The few previews that were shown prior to the movie's premiere did little to alleviate those fans' doubts about this project. There are a variety of reasons for this ranging from Avatar: The Last Airbender's live action movie (perceived by people to have been done very poorly)to the fact that there is some ShipSinking along with the fact that Timmy Turner [[spoiler:never grew up and is now a creepy ManChild]] Even though the movie has now aired, the reaction still is mixed about it.
* TastesLikeDiabetes: For those who didn't like the movie (and even for some who did), the ending was this and for being a very predictable and ''cliché'' ending.
* TearJerker: [[spoiler:Timmy and the fairies saying goodbye to each other near the end.]]
* TheyWastedAPerfectlyGoodPlot: Timmy being forced to make a difficult decision between finally growing up with the love of his life or continue to live the way he is with the family he loves so much? Sounds like it could have made the perfect finale for the series. But alas, that is not the case.
* UnnecessaryMakeover: The brief flashback to a live-action "young" Tootie is certainly more recognizable to the viewer than the live-action "adult" Tootie.
* WTHCastingAgency: Some of the cast.