Even though it's been over a decade since the last book in J.K. Rowling's Harry Potter series was released, the fandom surrounding her Wizarding World is as strong as ever. When fans aren't getting their Rowing fix from Pottermore, the Harry Potter and the Cursed Child play or the Fantastic Beasts films, they dive back into the Potter books and films to relive the Boy Who Lived's adventures once again.
There's no questioning the brilliance of Rowling's work, but whenever Potterheads rewatch the films or check out the original novels for the dozenth time, they notice that there were definitely some significant flaws we all missed. Some continuity, logic and costume errors are easily forgivable, but several of them are so glaring that it's surprising they weren't discovered and criticized sooner.
Die-hard Harry Potter fans, check out these shocking mistakes and see if any escaped your notice.
20 SENDING SLYTHERINS TO THEIR DOOM
When Professor Quirrell released a troll in the dungeons of Hogwarts School of Witchcraft and Wizardry to serve as a distraction so he could try to obtain the Sorcerer's Stone, Dumbledore responded to the castle's latest threat by sending all students back to their dormitories.
This might have been a good idea... if Slytherin's dormitories weren't in the dungeon. The headmaster's favoritism towards Gryffindor House is well-known, but it's still definitely a huge logic error that he basically sent a quarter of his students to their doom.
19 USING MAGIC AT HOME
If Harry Potter was able to use magic while residing at the Dursley house during the summer, life there probably could have been tolerable. Unfortunately, the International Statue of Secrecy, a wizarding law put into effect to hide the existence of witches and wizards from the Muggle world, prohibited him from doing so.
Harry almost got in major trouble with the Ministry of Magic in Order of the Phoenix for casting a Patronus Charm over the summer, yet in one of the films, he can be seen illegally using Lumos to read a book under his blanket.
18 DUMBLEDORE'S FAILED LOGIC
Several of Hogwarts' greatest professors teamed up to try to protect the Sorcerer's Stone. Dumbledore's genius trick to keep the powerful magical artifact out of evil hands was to use the Mirror of Erised to only allow someone who wanted to find the stone, but not use it, to be able to obtain it.
This logic doesn't actually work, since Quirrell wanted to obtain the stone to present it to Voldemort, and had no plans to use it himself. He thus should have been able to get it without any problem.
17 HEDWIG AND MAD-EYE MOODY'S UNNECESSARY SACRIFICE
When the magic which kept Harry safe at the Dursley's home wore off, the Order concocted a plan to help him get to the Burrow safely. Several members used Polyjuice Potion to look just like Harry, so Voldemort and his forces wouldn't be able to tell which of them was the real Boy Who Lived.
Mad-Eye Moody and Hedwig lost their lives in this epic Battle of the Seven Potters, but their sacrifice was unnecessary. Harry couldn't Apparate or use a Portkey from his aunt and uncle's home... but he could have just walked down the street and used one of those transportation methods without issue.
16 DEFYING THE LAWS OF MAGIC
It takes someone truly special to look after seven children on an exceptionally limited budget, but Molly Weasley could frequently be seen magically whipping up amazing meals for her crowded household with a smile on her face.
In Goblet of Fire, Harry saw her make sauce flow out of her wand, and while that's a really cool trick, it shouldn't have been possible. According to Gamp's Law of Elemental Transfiguration, food can't be created using magic. Apparently, J.K. Rowling forgot her own wizarding rules in this scene.
15 IT TOOK HARRY TOO LONG TO SEE THESTRALS
In the books, it made total sense that Harry wasn't able to see Hogwarts' thestrals until after the events of Goblet of Fire. Only people who have seen death can see those terrifying winged beasts, and Harry watched Cedric Diggory fall in the graveyard after the Triwizard Tournament's final task.
This doesn't quite work in the films, though, since Harry saw Quirrell die in Sorcerer's Stone. He should have been able to see thestrals after his first year.
14 HARRY POTTER AND THE SHAPE-SHIFTING PAJAMAS
Some movie scenes take multiple days to film, but set and costume designers are supposed to ensure that there's a sense of continuity to these scenes. Those experts definitely slacked off a bit in Order of the Phoenix. In one scene, Harry fell asleep in a blue t-shirt but after having some startling visions, he woke up in a much darker henley.
Unless Harry has the ability to change outfits while he's asleep, this is a pretty unforgivable mistake.
13 DUDLEY'S MAGICAL SHORTS
The wizarding world is filled with bizarre magical objects and items, so it's possible—though still very unlikely—that Harry actually purchased some shape-shifting pajamas in Diagon Alley. There's no logical excuse for Dudley's magical shorts in Order of the Phoenix, though.
The film's costume designers found two extremely similar shorts to throw Harry's cousin in, but there are clear differences between the pair Dudley started one scene in and the pair he ended the scene in. Why couldn't they just keep him in the same outfit?
12 THE DATES DON'T WORK
J.K. Rowling loved filling her Harry Potter novels with as many details as possible to paint the perfect pictures in her readers' minds, but not all of her extra details actually worked.
In the first Potter book, she stated that Harry's birthday on July 31, 1991, took place on a Tuesday. In reality, that date fell on a Wednesday. Rowling later said that Harry's classes at Hogwarts started on September 2, but if it's true that his birthday was on a Tuesday, then this date would be on a Sunday, despite the fact that Hogwarts doesn't hold classes on weekends.
11 THE WINKING SNAKE
Before Hagrid revealed the truth to Harry about his magical origins, a peculiar experience at the zoo forced the Boy Who Lived to recognize there was something different about him. He accidentally used magic to release a boa constrictor, and then he had a conversation with it.
This incident was later explained when Rowling revealed the existence of Parselmouths, but we still don't know how the snake winked at Harry before leaving its enclosure. After all, snakes don't even have eyelids and it'd be impossible for them to wink.
10 GREAT HALL MUSICAL CHAIRS
Here's another example of what can happen when a scene is filmed on multiple days and there's no one on set paying proper attention to continuity. While seated with the rest of Gryffindor House in the Great Hall, Harry started out his meal across the table from Hermione Granger and Percy Weasley. In another shot moments later, however, he was bizarrely seated between those two.
Unless Harry randomly decided to pick up his plate and walk all the way around the extremely long table to play some musical chairs, this was a clear blunder.
9 "YOU HAVE YOUR MOTHER'S EYES"
Here's a mistake which most dedicated fans have probably already noticed, but will never forgive. It's frequently mentioned throughout the Potter series that Harry shares his mother Lily's eyes, and this proves to be a significant plot point when Severus Snape begs to look into Harry's eyes in his final moments.
Snape was hoping to see a hint of his old love Lily before passing, but since Daniel Radcliffe's eyes didn't resemble the eyes of the women who portrayed his mother, this made absolutely no sense in the films.
8 NO TRIWIZARD TOURNAMENT PRIZE
Harry Potter fans who watched the films but never read Rowling's books likely think the only prize for winning the Tri-Wizard Tournament was a nice trophy and glory for the champion's school. The Goblet of Fire film left out the huge cash reward for the event's victor, and this omission was actually a significant mistake.
Harry gave his winnings to the Weasley twins in the book, and they used it to start Weasleys' Wizard Wheezes. The Weasleys are notoriously poor, so leaving out Harry's generous gift made Fred and George's ability to afford to start their own business extremely improbable.
7 HARRY AND HERMIONE'S BATTERY PACKS
One of the responsibilities of a costume designer is to make sure audiences can't see the microphones actors have to wear to make their voices pick up on camera. Eagle-eyed Potter fans likely won't be able to spot a single microphone in any of the films, but that doesn't mean the costume designers didn't make a serious error or two during the series.
Just check out these screenshots from Prisoner of Azkaban, in which the battery packs used to power up Daniel Radcliffe and Emma Watson's microphones made them look like hunchbacks.
6 CAN MUGGLES ENTER WIZARD-ONLY ZONES?
Even though Diagon Alley and Platform Nine and Three-Quarters exist mere feet away from the Muggle world, Arthur Weasley told Harry that Muggles cannot enter these magical spaces.
This made sense, but unfortunately, Rowling herself repeatedly contradicted this statement. Hermione's parents were seen in Diagon Alley with their daughter in Chamber of Secrets, and Lily Evans' parents joined her at Platform Nine and Three-Quarters in Deathly Hallows.
5 HERMIONE'S VANISHING FEET
It's not easy to make a gigantic CGI creature pick up a real-life actress, but when fans first watched Hagrid's half-brother Grawp pick up Hermione in Order of the Phoenix, no one really noticed anything wrong with the scene's special effects.
A rewatch of this moment reveals that something went seriously wrong during the editing process. Hermione's feet were somehow chopped off as Grawp lifted her up!
4 HOW MANY TRUNKS DOES RON HAVE?
Even though the Weasley family is supposed to be extremely strapped for cash, Ron can apparently afford countless trunks to bring to Hogwarts. He started out this scene with a suitcase that had several copper-like lines crossing around it. The trunk he had in a shot just moments later looked similar enough to it that it's hard to spot the differences at first glance, but it had fewer lines on it and is definitely not the same prop.
3 THAT MUGGLE FILMING HARRY AND DRACO'S DUEL
Harry's duel against his Hogwarts rival Draco Malfoy was one of the most memorable scenes in Chamber of Secrets, yet somehow, we all missed the massive production error that takes place during it.
After Harry knocked Draco down, a clearly-Muggle cameraman can be seen crouching down next to several students, filming the iconic moment from a different angle. Somehow, this embarrassing shot made it into the final cut of the film.
2 WE SEE THOSE SIDEBURNS, QUIRRELL
Lord Voldemort likely chose Quirinus Quirrel as his host body in Sorcerer's Stone because the professor was so anxious and easily manipulated, but it may also be because his baldness prevented the Dark Lord from having to hide behind a head of hair.
Ian Hart apparently didn't want to actually shave his head for the role, though, because his sideburns can briefly be seen underneath his turban at one point during the film.
1 VISIBLE TAPE MARKS
In order to ensure actors wind up in the right spot for a specific scene or say their lines in the correct area of a frame, directors often lay down some tape to help them hit their marks. These tape marks are typically edited out or colored to blend in with the floor, but the duct tape laid down in this Chamber of Secrets scene was totally visible and made it into the film.
The scene is especially funny when you watch it looking specifically for this tape, because several characters were clearly told to speak their lines immediately upon crossing it.