!!YMMV tropes present in the book:
* EnsembleDarkHorse: Sirus and Remus.
* FridgeBrilliance: Why is Snape almost psychotic with rage over Sirius' escape at the end? [[spoiler:Because, as far as he knows, Sirius is the one who betrayed the Potters and thus got [[TheLostLenore Lily]] killed]] - rather less petty than the childhood grudge everyone assumes (although Snape's holding onto that, too).
* FridgeHorror: Harry's essay 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?
** Also, how is Goyle's father going to react when he learns that [[spoiler:Pettigrew, as Scabbers, ended up biting Goyle on the knuckle during the Weasley's first year?]]
* FunnyAneurysmMoment: At one point in 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 [[spoiler: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.
** Also Ron carrying him around in his pocket and Scabbers even fell 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 as evidence.
* HilariousInHindsight: "Can I have a look at Uranus too, Lavender?" You'll get your chance, Ron, when [[spoiler: you start dating her in Book 6.]]
* HoYay: Sirius and Lupin. Even more so in [[Film/HarryPotter the movie]].
** [[BigDamnKiss Big Damn Hug, anyone?]]
* LateArrivalSpoiler: You'd be very hard-pressed to find ''anyone'' who doesn't know the twist of the book's plot.
* 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, 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.
* StrawmanHasAPoint: Lucuis Malfoy is a pretty awful person, who attempted to assault Harry at the end of last book for freeing Dobby, but is it really difficult to see Hagrid as a DesignatedHero for trying to keep Buckbeak at school? In the "Fantastic Beasts and where to find them" book it list Hippogriffs as one of the most dangerous beasts known to wizard kind and Hagrid thought it was appropriate to have thirteen year-olds approach them and train them? Granted Draco screwed up practically on purpose, but what if it was another student being attacked by accident?
* WhatDoYouMeanItsNotPolitical: Along with Umbridge, Aunt Marge's character was intended as a caricature of Margaret Thatcher, whom Rowling dislikes immensely.
** This statement should be treated with caution. J.K. Rowling mentioned Thatcher [[http://www.accio-quote.org/articles/1999/1099-connectiontransc.html only once in an interview]], and she only said she imitates Thatcher's voice when she's reading Professor Mc Gonagall's lines to her children.

!!YMMV tropes present in the film:
* 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. That scene has never made any sense. And they left so many important bits out...
** The talking shrunken head on the Knight Bus.
*** Rowling has stated that she finds the shrunken head hilarious and "wishes [she'd] thought of that."
** The School Choir replacing the Sorting Hat, although that did allow for the CrowningMusicOfAwesome "Double Double."
** A long shot of a blue bird flying through the castle and getting killed by the Whomping Willow.
*** The long shots of the Whomping Willow were often used to show the changing of the seasons, but the one with the bird could be ForeShadowing the importance the Willow has later in the book.
** A shot of the ghost of a knight crashing through the window and running through the Great Hall being chased by another ghost which the characters completely ignore.
*** For the random knight-through-the-window and the blue bird, see RuleOfCool and RuleOfFunny, respectively.
* 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.
* 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).
* InternetBackdraft: Best movie in the series? Worst movie in the series? Middlingest movie in the series? Whatever your opinion, a huge chunk of the FanDumb will loathe you for it.
* MemeticMutation: '''SIRIUS ''DID'' HIS WAITING! ''TWELVE YEARS'' OF IT! ''IN AZKABAN!!!'''''
** HE WAS THEIR FRIEND!
* {{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.
* StrawmanHasAPoint: See above
* TheyChangedItNowItSucks: 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 forced comedy of the shrunken heads added to the Knight Bus.
----