Harry Potter has amassed one of the largest fandoms in the world. Potterheads, as members of this fandom call themselves, seem to know every little detail regarding the series. But, there are certain things in the series that even Potterheads may have missed. J.K. Rowling did a really good job of hiding hints that would reveal what’s to come. Even if you re-read or re-watch the first installment, you’ll find things you’ve never seen before. But, beyond the plot details, there were some movie goofs and facts you may not have picked up on. Here are 15 of them.

15 The goofs in the films

Nothing is perfect. And as much as we love the Harry Potter movies, even we can admit they’re not perfect…close, though. There were a few goofs and oversights throughout the series. You’d have to look pretty hard to see these ones, though. In Sorcerer’s Stone, not only does Ron have a bit of dirt on his nose, but his hair does a flip (it was parted in the center at first, then to the side, in the same scene). Later in the same film, the wires holding up some of the candles are visible. And in Prisoner of Azkaban, the outlines of the actors’ power packs (for their microphones) are visible through their clothing. There are a bunch of other mistakes, too. While they aren’t important to the plot, it is fun to know about them so that you can look out for them the next time you’re re-watching the series.

14 Daniel Radcliffe was drunk while filming certain scenes

Harry Potter fans are probably well aware that Daniel Radcliffe had a battle with alcoholism while he was filming the Harry Potter series. The actor even admitted to showing up to work drunk, saying “I can point to many scenes where I'm just gone. Dead behind the eyes.” Knowing this information changes everything, right? Well, actually, it doesn’t change the fact that he is a talented actor. If anything, it kinda makes him seem more talented (since he was able to hide it so well). But, if you’ve got the eyes of an eagle, perhaps you can spot the scenes in which Radcliffe was drunk. It’s believed that he was drunk during the scene where he drinks liquid luck and Aragog’s death scene in Deathly Hallows.

13 Why the Remembrall turned red

In Harry Potter and the Sorcerer’s Stone, we are introduced to Neville Longbottom. Our first clue that he’s more on the clumsy side than anyone else is that he loses his pet toad, Trevor, on the Hogwarts Express. Then, he receives a gift from his grandma—a Remembrall. It is a clear, glass ball that contains smoke which turns red when its owner has forgotten something. Neville infamously says that he can’t remember what he forgot (silly wizards, didn’t they think of that when they invented this?). If you were paying close attention the first time, you may have picked up on what Neville forgot. It was his robe! We can’t believe we missed that!

12 The number 13 predicted both Dumbledore’s and Sirius’ death

Ah—the number 13. It’s been long associated with bad luck. Even in the world of Harry Potter, this number means trouble. Professor Trelawney refuses to sit down at a table in the Great Hall saying, “I dare not, Headmaster! If i join the table, we shall be thirteen! Nothing could be more unlucky! Never forget that when thirteen dines together, the first to rise will be the first to die.” Everyone thought she was crazy, but she was actually right. Since Peter Pettigrew was disguised as Scabbers, that would mean there were already thirteen people at the table. Dumbledore was to first to rise (he rose to greet Trelawney) and first to die out of those sitting at the table. The same thing also happened with Sirius Black. Looks like Trelawney knew what she was talking about.

11 The characters’ wands are connected to the Celtic tree calendar

We bet you thought that the wood with which the wands were made from was just totally random. Right? Well, we thought so. Then, we learned that for the main characters, at least, the wands are actually based on their birthdays, according to the Celtic tree calendar. First, we have Harry, whose birthday is July 31^st. This coincides with the wood, holly, which is what Harry’s wand is made of. Even more interesting, is that holly is the tree of sacrifice (which goes to show his fate was set from the start). Hermione’s wand is made of vine, which corresponds to her birthday, September 19^th and Ron’s wand is made of ash since his birthday is in March. Pretty cool, huh?

10 Harry’s scar is off-center

Harry’s scar is iconic. That lightening-shaped mark on his forehead sets him apart, has an entire story behind it and connects Harry to Voldemort (and later in the series, we find out how exactly the two are connected). It’s interesting, then, that the precise, physical details of such an important feature of the main character are not revealed in the books. That is, Rowling never specifies where on Harry’s forehead the scar is located. Due to the artwork on the covers of her books, many people think that his scar is supposed to be in the center of his forehead. Even we thought so at first! It seems fitting, right? In the film, however, the scar on Harry's forehead is off-center, as J.K. Rowling requested.

9 Petunia referenced her meeting with Snape since Harry Potter and the Order of the Phoenix

It was pretty shocking when, in Order of the Phoenix, Harry’s muggle aunt (Petunia) revealed she knew what the Dementors are. How did she know? Sure, she’s Lily’s sister, but the two didn’t get along once Lily’s magical powers were revealed. Well, when asked, Petunia says, “I heard that awful boy telling her about them years ago.” What awful boy? Fast forward to Deathly Hallows and you have the answer: Snape. That’s right—Petunia referenced her meeting with Snape since Order of Phoenix! But it wasn’t until we got a glimpse of Snape’s memory that we realized this (if we paid attention and connected the dots). In Snape’s flashback, Lily asks him about the Dementors and Snape explains they guard Azkaban (which Petunia overheard, apparently).

8 Snape’s hidden clue

After reading this list, you may want to go back and read all the books again just to see all the hints Rowling dropped about what was to come. Some of the hints are well-disguised though. Unless you have a passion for Latin or herbs, they’ll go right over your head. One well-disguised hint about Snape’s love for Harry’s mother, Lily, came during Harry’s first Potions class. Snape asks Harry, “What would I get if I added powdered root of asphodel to an infusion of wormwood?” Of course, Harry (being new to the wizarding world) had no idea. Snape doesn’t reveal the answer, either. But, if you were to do some research, you’d realize asphodel is a type of lily meaning “my regrets follow you to the grave” and wormwood means “absence” but also symbolizes bitter sorrow. If we combine these two meanings, we’d have something close to “I bitterly regret Lily’s death.” Mind-blowing indeed.

7 Product placement

There are so many intricate details in Harry Potter. When you look at the scenery in the movies, you can’t help but be amazed. Everything seems so well-thought-out from the candles floating above in the Great Hall to the Converse shoes that Luna is wearing…wait, what?

If you look closely during Order of the Phoenix, you can see Luna Lovegood sporting a pair of strawberry-printed high-top Converse. And of course, in Deathly Hallows, Harry is wearing a Belstaff jacket. Product placement, much? These ones were probably hard to spot because there aren’t very many product placements in the series. Apparently, in the first six films, there were only nine products that could be seen.

6 Wormtail’s clothing mystery

You’ve probably noticed that when the characters transform into their animagus form, they leave their clothes behind. But, if you didn’t pay close attention, you might not have noticed that in The Prisoner of Azkaban, Peter Pettigrew (AKA Wormtail) transformed into his animagus form (the rat, previously known as Ron’s pet, Scabbers) and left his clothes behind on the Hogwarts grounds as he scurried off. Then, in the following film, Goblet of Fire, he returns with the same outfit! How is that possible? Is there some secret spell for that, too? It is the wizarding world, so we suppose anything is possible but this one really had us scratching our heads in confusion.

5 Tonk’s hair

Not only is Harry’s eyes blue in the movies when they were written as being green in the books, but did you notice that Tonks’ hair is pink in the books but purple in the movie? In Harry Potter and the Half-blood Prince, there’s a line that reads: “Certainly her appearance was less colorful than usual without her customary shade of bubble-gum-pink hair.” So, what’s up with the purple hair? Well, the filmmakers decided that they shouldn’t make it pink, since Umbridge’s character was associated with pink. They wanted to separate the characters as much as possible. But, we have a feeling it wouldn’t have mattered much if Tonks had pink hair in the movie. Seriously, Umbridge was totally evil and Tonks, though a bit odd, was a sweetheart.

4 The books mirror each other

One of the reasons the Harry Potter series is so captivating is because of the details and how they connect from one installment to the next. It goes without saying that J.K. Rowling has an amazing imagination, but we can’t help but wonder how she managed to keep track of all the little details throughout the series! Even more than just simply connecting to each other, the books actually mirror each other! For example, in Sorcerer’s Stone (the first installment), Harry sees his parents in the Mirror of Erised and he sees them again in Deathly Hallows (the last installment) after using the Resurrection Stone. In Chamber of Secrets, Harry finds a dangerous, old book (Riddle’s diary) and in Half-blood Prince, he finds another one (Snape’s book). These are just a few instances; there’s an entire list of them documented online.

3 Ron and Hermione’s Patronuses prove they’re soulmates

When we read the first Harry Potter book (and later, watched the movie), we thought Harry and Hermione would wind up together. Clearly, that didn’t happen (perhaps it would have been too predictable). Instead, Harry ended up with Ginny and Ron ended up with Hermione. Who saw it coming? There were actually quite a few things in the movies and the books hinting at their future romance. In Prisoner of Azkaban, Hermione accidentally grabbed Ron’s hand when she was startled by a hippogriff. In fact, there is an entire list of clues, but the cutest one lies in their Patronuses. Ron’s Patronus is a jack Russell terrier and Hermione’s is an otter. Jack Russells are known to chase otters. Even cooler is that otters are part of the weasel family (weasel, Weasley…get it?). Looks like she belonged with him right from the start!

2 Hedwig is supposed to be silent

Hedwig, Harry’s beautiful snowy owl, is one of the best creatures in the series. She was such a loyal and intelligent owl and Harry cherished her as she was the first birthday present he’d ever received. But, what do we really know about Hedwig? Well, if you know anything about snowy owls, you’d know that they are silent. But, Hedwig isn’t silent—she hoots and makes other owl-like noises. J.K. Rowling admits that it was an error on her part and she didn’t realize it until she was writing book two. Harry Potter fans didn’t seem bothered by it, though. Most just assumed it was normal for a magical creature.

1 Cedric's death was foreshadowed

By this point, we know that there is a lot of foreshadowing in the HP series. Even in the very first book, there’s a clue about something huge that would happen in the fourth book. Hagrid mentions to a centaur (Ronan) that a unicorn’s been hurt and Ronan replies, “Always the innocent are the first victims.” OK, so why is that significant? What could it possibly be foreshadowing? Well, think about who the first innocent victim in Harry’s time at Hogwarts was. That’s right—Cedric. And what was Cedric’s wand made of? Unicorn hair. Mind blown (for the umpteenth time). Seriously, how did J.K. Rowling do it? Or was it just a coincidence? The questions we’d love to ask her…

Sources:

hngn.com, moviepilot.com, whatculture.com,  bustle.com, pottermore.com, mentalfloss.com