!!YMMV tropes present in the book:
* AccidentalAesop: Hermione's subplot could be interpreted as, "Doing well in school is great, but your mental health comes first. If school is putting a strain on your well-being, it's not worth it."
* AlternateCharacterInterpretation: Sir Cadogan, the portrait that takes over guarding Gryffindor Tower for The Fat Lady after she's attacked by Sirius Black, and whose work style involves setting "ridiculously complicated" passwords, and changing them at least twice a day. Is he stark raving mad, or ProperlyParanoid taken UpToEleven?
* EndingFatigue: Not ''too'' bad, but off to [[spoiler:see Buckbeak get executed - diverted to shrieking shack, long PlotDump, Werewolf ensues, time turner, going ''back though the evening'']] and THEN it's over.
* FridgeBrilliance:
** Snape asks Lupin if Harry might have gotten the Marauder's Map from one of the makers. [[spoiler: Considering he went to school with the Marauders, and was likely insulted by them in the same way as the map (as well as familiar with their nicknames), he probably suspects that Lupin had something to do with the map - which he does]].
** In the film, the music Lupin plays during the Boggart lesson. Seems silly at first but then you realise he's trying to keep the mood light so the students will be able to imagine their worst fears as something comical.
** The first time Ron and Harry notice Hermione has briefly stepped away from them between classes, she changes the subject by voicing her hope that there's something good for lunch, she's starving. Of ''course'' she's starving: [[spoiler:she's just used the Time Turner to live through twice as many hours since breakfast as they did!]]
* FridgeHorror: Harry's textbook poking lighthearted fun at [[BurnTheWitch witch burnings]]. Sure, it was no more than a mild inconvenience for the wizard ([[TooKinkyToTorture one witch liked it so much that she kept allowing herself to be captured]]), but what about those poor Muggles misidentified as witches, who really ''are'' being burned at the stake?
* FunnyAneurysmMoment:
** At one point in ''Literature/HarryPotterAndThePhilosophersStone'', Scabbers bit Goyle on the knuckle (which was even referenced by Fred and George Weasley in Azkaban). Come ''Azkaban'', and the revelation that Scabbers was actually Peter Pettigrew, who was the true person responsible for leaking Lily and James Potter's location to Lord Voldemort and thus their deaths, not to mention the revelation in ''Goblet of Fire'' that Goyle's father was most likely one of Pettigrew's comrades among the Death Eaters it becomes somewhat disturbing.
** Ron carrying him around in his pocket and Scabbers even falling asleep on Harry's bed at one point in ''Philosopher's Stone''.
* GrowingTheBeard: Many fans believe that this is the turning point for the series as a whole, citing the encounter at the Shrieking Shack, the darker emotions and actual feelings of loss Harry feels about his family (that had not been really explored in the previous books) and of course the BittersweetEnding. [[spoiler:Sirius is proven innocent to Harry and Dumbledore but remains on the run alongside Buckbeak, and Lupin has to quit, while Harry worries about Trelawney's prophecy and the consequences of sparing Wormtail potentially bringing Voldemort back. Compared to the out-and-out positive victories in the first two books, it was bleaker and prepared for the gradual darkening of the remaining books]].
* HilariousInHindsight: In the novel, Hagrid expresses worry that Buckbeak might have encountered [[spoiler:werewolf!Lupin]] in his escape from Hogwarts. As the [[Film/HarryPotterAndThePrisonerOfAzkaban movie]] illustrates, Hagrid need not have worried for Beaky's welfare in [[CurbStompBattle such a fight]].
* HoYay: Sirius and Lupin. Even more so in [[Film/HarryPotter the movie]].
** The following line was cut from American editions of the book. Make of that what you will.
--> The professor walked to Black's side, [[HoldingHands seized his hand]], pulled him to his feet [[DramaticDrop so that Crookshanks fell to the floor]], and [[ManHug embraced Black like a brother.]]
* IdiotPlot: The denouement at the end depends on the following characters (Snape, Remus) suddenly forgetting the following details:[[spoiler:Remus is a werewolf, tonight is a full moon, and Remus has to take the Wolfsbane potion. Remus forgets about it entirely, despite the fact that he has lived with it all his life, which can only be explained in a character sense about how seeing Sirius and Peter Pettigrew on the Marauder's Map makes him think differently. Snape however comes ''to Remus room with the Potion'' (which he mentions during their confrontation) and despite having had a traumatic experience in his youth at the Shrieking Shack, still goes down there to meet Remus without having any real backup plan against a werewolf set to transform. Without this contrivance, Peter Pettigrew would not really be able to escape and Sirius still be on the run]].
* HilariousInHindsight: "Awful things happen to wizards who meddle with time, Harry." And in the very next movie, [[Series/DoctorWho a certain time-travelling alien]] gets a FateWorseThanDeath.
** The part where Snape gets insulted by the Marauder's Map after Pottermore revealed that it was designed to do that to Snape and ''only'' Snape, not just anyone who tried to read it without the password.
* ItWasHisSled: Sirius ain't evil. Lupin is a werewolf. Ron's pet rat Scabbers is really Peter Pettigrew, a human.
* MemeticMutation
** Hermione's white face.[[note]]The only line in the entire series indicating Hermione's skin color, used as a justification for fans that don't like the casting of a black actress in Theatre/HarryPotterAndTheCursedChild [[/note]]
* OlderThanTheyThink: Many people assume that Rowling invented Hippogriffs for this book. [[http://en.wikipedia.org/wiki/Hippogriff She didn't]].
* OneSceneWonder: Aunt Marge only appears in one chapter (which has her name on it), but still manages to be among the more despicable characters in the series, perhaps even more so than her brother Vernon.
* ShippingGoggles: The series has enough of this to fill a page, but this entry probably has the best example, what has been dubbed "The Symbolic Flight". This theory states that because Harry and Hermione flew together on Buckbeak together and without Ron, that they are destined to be together - ignoring the fact that Ron was only not present because he broke his leg earlier.

!!YMMV tropes present in the film:
* AccidentalInnuendo: The scene from the book listed above is even more dodgy in the film, when Harry's Uncle Vernon keeps bursting into the room to find out what's going on. Vernon is played by Richard Griffiths, AKA [[Film/WithnailAndI Uncle Monty]].
* BaseBreakingCharacter: The Shrunken Head on the Knight Bus. Some find him bizarrely out of place and unnecessary, others find him a nice bit of comic relief. It's worth noting that it was approved by JK Rowling - who prevented Alfonso Cuaron from inserting a choir of tiny people playing the piano.
* BetterThanCanon: The AdaptationExpansion for the Time Turner sequence is widely agreed to be a big improvement over how it was handled in the books. A few readers missed the {{Foreshadowing}}, and thus found the twist to come really out of nowhere. The film expands on this - having Hermione suddenly turning up out of nowhere in classes at points throughout the film. Also the twist [[spoiler: that Harry himself conjures the big Patronus]] is Foreshadowed by having more events influenced by the time travellers - throwing the pumpkin seeds to warn that Fudge is on the way for example.
* BigLippedAlligatorMoment:
** After everyone arrives at Hogwarts to start the new year, the Fat Lady won't let them into Gryffindor Tower because she's too busy trying to shatter a glass with her voice.
** A lot of screentime is devoted to a blue bird flying through Hogwarts and twittering around; far longer than normal for a scene transition. The deleted scenes show that the sequence ran even longer - with the bird buzzing around Hagrid's head before getting shooed away.
** The choir singing an arrangement of the witches' chant from Theatre/{{Macbeth}}... along with croaking toads?
* BrokenBase: Half the fanbase considers this one of the best (if not the best) Harry Potter film in the franchise, or at least when the Harry Potter films started getting good. The other half considers this movie to be one of the worst (if not the worst) Harry Potter film in the franchise. The film was mostly better received by critics than the first two, although it was the first HP film not to get four stars from Roger Ebert. Also, this is J.K. Rowling's favorite film. General consensus seems to be that the cinematography and visual effects are excellent, but the acting and script bring it down in places.
* ContinuityLockOut: This was the point when the movies started to get hard to understand for anyone who wasn't already familiar with the respective books. Most notably, this movie never makes it clear who Padfoot, Wormtail, Moony, and Prongs are, despite later movies operating on the assumption that the viewers all know.
* CriticalDissonance: The film was adored by critics when it came out, opening to the most critical success any ''Potter'' film had seen at that point. On the other side, it left the ''Potter'' fanbase fairly polarized.
* DarkerAndEdgier: ''Much'' more so than the previous two films, signalling the shift in tone for the remainder of the series.
* GrowingTheBeard: According to most professional critics, along with about [[BrokenBase half]] of the fans. At the very least, people agreed that the younger actors and actresses were finally fitting snugly into their roles (aside from the {{Narm}} mentioned below). What's more is that this was the first film to make deviations from the book in the name of PragmaticAdaptation, paving the way for the future films to do so (without falling into InNameOnly).
* InternetBackdraft: Best movie in the series? Worst movie in the series? Middlingest movie in the series? Whatever your opinion, a huge chunk of the fandom will loathe you for it.
* MemeticMutation:
** '''SIRIUS ''DID'' HIS WAITING! ''TWELVE YEARS'' OF IT! ''IN AZKABAN!!!'''''
** HE WAS THEIR FRIEND!
** Turn to page three-hundred and ninety-four.
* {{Narm}}:
** The movie is full of it, most notably Harry's crying scene in Hogsmeade (blame Daniel Radcliffe), Draco getting attacked by Buckbeak (blame Tom Felton), and the punching scene (blame Emma Watson, Tom Felton, '''and''' Creator/SteveKloves).
** Apparently "believing in yourself" equates to SHOUTING AT THE TOP OF YOUR LUNGS. No quiet confidence in the film version of the Potterverse. EXPECTO LOUDYELLUM!
** Malfoy being attacked by Buckbeak, which was ''deliberately'' {{Narm}}-y; in the book, it was stated that he over-played how bad the injury really was. Why? Because he's Draco Malfoy and he's a whiny brat. And because he wanted to get Hagrid fired.
** The FlyAtTheCameraEnding, with overly long freeze frame.
** Sirius's IKnowYoureInThereSomewhereFight with Lupin, wherein he makes a futile attempt to use ThePowerOfLove and The Power of [[LargeHam Ham]] to convince Lupin to not turn into a werewolf. And then Lupin does turn into a werewolf, which looks like a balding chupacabra (unlike the book, where werewolves only have slight physical differences from normal wolves).
** The sheer number of times the whirring sound effect is used for any and every spell that is cast.
* NarmCharm: The examples in the above entry, as well as "You foul, loathsome, evil little ''cockroach!''" They're a near 50/50 mix of [[CrowningMomentOfAwesome awesome]] and [[{{Narm}} narm.]]
* NeverLiveItDown: A lot of the fandom's complaints with Hermione stem from this film. Namely her getting Ron's line standing up to Sirius and her action scene on the Whomping Willow (despite the fact that she gets into a worse scrape than Harry in that one). If the fans ever complained about Steve Cloves turning Hermione into the CreatorsPet, expect this film to be mentioned as the root of it.
* NoProblemWithLicensedGames: The Game Boy Advance version, mostly.
* TheyChangedItNowItSucks: The film's drastic changes from the book were not welcome to some.
** Alfonso's complete redesigning of Hogwarts geography, coupled with the overall more comedic tone the film has compared to the previous two, not to mention the ShrunkenHead added to the Knight Bus.
** The excision of the explanation of the identities of Moony, Wormtail, Padfoot, and Prongs, which confused many moviegoers who hadn't read the books. Especially since it would have been relatively simple to slip into [[spoiler: Lupin's final scene.]]
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