- Adaptation Displacement: The games are based more on the movies than the original books; though since these are the Cliffs Notes versions of the plots anyway, the difference is rarely noticeable.
- Anticlimax Boss: Voldemort is ridiculously easy for the Final Boss of Harry Potter: Years 1-4. His entire boss fight consists of defeating a few Death Eaters and the occasional Beam-O-War between Voldemort and Harry, where you need to button-mash your way to victory.
- Ho Yay: Ron under the influence of a love potion. In the book, he babbles about Romilda Vane. Here, he fawns over Harry... and Professor Slughorn.
- Most Annoying Sound:
- Every student you pass greets you with the same high-pitched "Huh Nuh".
- Nothing's worse than the Mandrakes. As soon as you go near them or pick them up, they start screaming and don't stop until you put them in the pot — which is often hidden behind some other scenery you need to destroy first, meaning that you don't find it until later on in the scene. You can make them a bit more bearable by buying the Singing Mandrakes bonus.
- The Playstation 4 port plays the Student in Peril screams through the controller's speaker, with the audio getting louder as you approach the location. The problem is that you will hear screaming from anywhere within the entire area, and with many students imperiled in ways you won't have access to without later-year spells, you're just stuck listening to it until you turn the controller audio off.
- Porting Disaster: The PC version of both Years 1-4 and 5-7 are prone to crashing and freezing at certain points in the game, making it impossible to progress further.
- The Vita version of Years 5-7 can have the framerate drop to abysmal levels.
- That One Level:
- The Forbidden Forest levels in Harry Potter Years 1-4. Not particularly hard levels, but there are a lot of lego flowers and bushes lying around and if you want those LEGO studs for True Wizard (not to mention buying unlockables), you need to spend a good amount of time destroying all of them. Fortunately, if you are not above cheating, using the Multiplier red bricks makes this a lot easier.
- The bonus level in Years 5-7 can easily become this. You need to find 1000000 studs, by wreaking havoc in a small Lego town. Near the end of your goal, you probably have destroyed all of the obvious places, resulting in you running aimlessly around the level, searching for these last few studs. And you can't cheat your way out of it by turning on Stud Multipliers.
- That One Sidequest: The Slytherin Crest in the "Magic Is Might" level of Harry Potter 5-7. Not only is it hidden behind a pillar, but you are being chased by Dementors so you have very little time to detour for it. Plus, if you miss it or get caught by the Dementors, it respawns you after the Crest, so you have to play through the entire level and redo the very long boss fight for another shot at it.
YMMV / LEGO Harry Potter