Plot Holes In 'Harry Potter' Fans Couldn't Help But Notice

From Redditor u/Chgr:

In the first movie, on the very beginning when Harry and Hermione are Hogwarts students just for a few weeks, they roam through Hogwarts, they come to the door behind which there is something valuable as they believe. But then, Harry sadly notices that the door is locked. So then a Hermione does a spell, "Alohamora," and unlocks it. Why in the Earth would anyone, especially wise wizards leave anything valuable behind locked door as a security when anybody, even those who are students there just for few weeks, can just do freaking Alohamora?

From Redditor u/Duplakk:

In the 9th chapter, "The Writing on the Wall" of Chamber of Secrets, there is this part:

“You don’t care about Ginny,” said Ron, whose ears were now reddening. “You’re just worried I’m going to mess up your chances of being Head Boy!” “Five points from Gryffindor!” Percy said tersely, fingering his prefect badge. “And I hope it teaches you a lesson! No more detective work, or I’ll write to Mum!”

This shows, that Percy as a prefect was able to dock points. Whereas in the 28. chapter, "Snape's Worst Memory" of The Order of the Phoenix:

“Now, do you really want to finish that sentence, Granger?” Draco Malfoy had slid out from behind the door, followed by Crabbe and Goyle. His pale, pointed face was alight with malice. “Afraid I’m going to have to dock a few points from Gryffindor and Hufflepuff,” he drawled. “It’s only teachers that can dock points from Houses, Malfoy,” said Ernie at once. “Yeah, we’re prefects too, remember?” snarled Ron. “I know prefects can’t dock points, Weasel King,” sneered Malfoy;

So... What's the deal? Plothole? Did Rowling ever tell anything about this?

From Redditor u/leashkid:

So the Ministry of Magic keeps insisting that students cannot use magic out of school and yet at the start of the third movie Harry learns Lumos Maxima under his bed covers. How is he allowed to do that? I mean he almost gets expelled because Dobby levitated pudding in the second book...

From Redditor u/Chuckgofer:

In Order of the Phoenix, we learn that the magic horseless carriages aren't actually horseless, but drawn by thestrals, a sort of magical reptilianesque pegasus. One of their main traits is that they are invisible to anyone who hasn't seen someone die. Luna can see them, and Harry can see them in Book 5.

I get why he couldn't see them in the first 4 years at Hogwarts. Lets assume he didn't really SEE his mother die as a child. Or even if he did, wasn't really aware of it.

However, at the end of Goblet of Fire, during the last event of the Triwizard Tournament, he witnesses Cedric Diggory get killed by Voldemort.

It stands to reason, then, that Harry should have seen the thestrals pulling the carriages back to Hogsmead station at the end of Book 4. He had just witnessed Cedric die.

From Redditor u/theunemployedjd:

When someone is named secret keeper, nobody else can tell the secret except the secret keeper himself. Even if the person heard the secret from the secret keeper. This is apparent from the fact that when the Order of the Phoenix transports Harry to Sirius's house/headquarters, they could not tell him the location but needed to hand him a note sent to him by Dumbledore, the secret keeper.

However, when Dobby saves Harry from the Malfoys' dungeon in the last book, Ron tells him to apparate into Bill and Fleur's cottage and does so. But we later learn that the Fidelus charm has been placed on the cottage and Bill is secret keeper. Ron should not have been able to tell anyone the whereabouts of the cottage.

From Redditor u/themanhimself13:

Hermione, the most brilliant witch of her age, hasn't heard of him nor can she find anything about him after searching the whole library. Seems a little weird, I reckon.

From the Harry Potter Wiki: "Nicolas Flamel (before 1327[1] – between 1992 and 1996[2]) was a well-known alchemist..."

A 'well-known' alchemist. Let's use Dumbledore's Chocolate Frog card as a source as well: "Professor Dumbledore is particularly famous for... ...his work on alchemy with his partner, Nicolas Flamel."

They could've chosen anything from Dumbledore's many achievements, yet they choose to note his work with Flamel. This implies that Flamel is quite famous. Ron himself says he has about six of Dumbledore's card. He's read it at least six times. Harry briefly read it once, and recalls it halfway through the book. The Hogwarts library has nothing on Flamel. The Philosopher's Stone says that the library has 'tens of thousands of books.' The alchemist known for achieving immortality, nowhere to be found. In the Deathly Hallows book, Dumbledore's memorial in the newspaper by Elphias Doge says: "He was soon in regular correspondence with the most notable magical names of the day, including Nicolas Flamel, the celebrated alchemist; Bathilda Bagshot, the noted historian; and Adalbert Waffling, the magical theoretician."

He is placed with Bathilda Bagshot and Adalbert Waffling as notable magic names of the day. He appears to be quite well-known. Another thing is the fact he isn't in any books.

He wasn't in Great Wizards of the Twentieth Century, or Notable Magical Names of Our Time; he was missing, too, from Important Modern Magical Discoveries, and A Study of Recent Developments in Wizardry.

Great Wizards of the Twentieth Century should include him since his collaboration with Dumbledore implies he was active as an alchemist up until his death. The other three may be excused due to the Philosopher's Stone not being very recent, I guess, but he may have made alchemy discoveries due to him being active for nearly 500 years.

What's going on? Am I high?