Not sure if this counts, but a lot of people question why it was Lily's love that defeated Voldemort and saved Harry, and not Jame's. No, it's not because a mother's love is different than a father's, it's because James was killed outright, he was never given a choice. Lily however, was asked by Voldemort to step aside (Per Snape's request), but she refused. And that's why it's powerful, she was spared, but chose to die for Harry anyways

People over use the term plot hole. Just because someone made a bad decision doesn't make it a plot hole. The issue has to break built up rules or logic.

I really like when fantasy stories address how spells can be changed and improved over time.
This is something that comes up in Frieren.

Your Veritaserum answer is actually 100% canon. Fudge says in the Goblet of Fire: “certainly Crouch may have believed himself to be acting upon You Know Who’s orders, but to take the word of a lunatic like that”, so Fudge knows Veritaserum just makes people say what they believe is the truth.

Regarding the point of the secret keepers, one would even think that there was a drive to improve the spell after the highly publicized death of the Potters, following their betrayal by their secret keeper. It is reasonable that Dumbledore, being an accomplished research wizard, went to work on it and had managed to get around the "no keeping your own secret" obstacle by the time the Second Wizarding War rolled around. Of course, the breakthrough may also have been made by somebody entirely different, whom the series never bothered to name, but Dumbledore at least had the qualifications and the motive to do it.

1:34 I stand by my opinion that turning Dumbledore down for being their secret keeper was the stupidest thing possible.

I’m still waiting for Brett to address his past and come to terms that he ACTUALLY IS HUFFLEPUFF

On the Hermione "Obliviate" Plot-hole, there may be confusion, because the Movie version has Hermione perform "Obliviate" on her parents (you hear her say it directly). So perhaps there's some conflation going on?

After Dumbledore tells Fudge about Crouch confessing using veratiserum in the Goblet of fire, Fudge says that hes sure thats what Crouch thought was true but he was a lunatic, so thats basically what you said. Also, if that was the main way to serve justice, people would just modify their own memories after commiting a crime.

James and Lilly weren't their own secret keepers because they wanted to see their friends.  

If James was keeper he would have to come out of the house to tell each of his friends the secret before they could enter.

But he knew that the house was surrounded, and he couldn't even peek his head out without risking getting it blown off.

And they used Peter because everyone assumed it would be Sirius and that would put him in danger.

The Horcrux one is literally explained in the book

I think the simplest explanation is that the Weasley twins just never looked at Gryffindore Common room on the map. The movie shows realistically that Marauder’s Map is folded and you have to unfold it specifically to look at different sections of such an enormous place as Hogwarts with its grounds on top. I find it perfectly plausible that Fred and George never looked at their Common room, it’s not interesting, no one can catch them there, they have the right to be there at night. So, why check there? Maybe they looked once when they found it and there was no point afterwards.

After seeing the video you mentioned at the end, I need to address the plothole about wizard poverty:

I think that plothole ignores the economic models of pricing and wages. Yes, wizards and witches have access to magic, making many muggle expenditures go away (if you are talented enough). BUT it also greatly limits the sources you can make wages. With muggles you can make a living repairing clothes or cleaning. Not so much with magical communities. And what would happen if suddenly most works in our society would vanish? There would be a lot of people without a job. There would be huge surplus of workforce with not enough jobs. It would depress wages. I believe that's the issue with wizard economy; not enough productive jobs to add value.

As far as I know, Malfoy's family got rich by trading with muggles, before statute of secrecy. And it makes sense. Muggle society is far larger, and they tend to produce a lot of excess for use, sales and storage. If Malfoy family could provide magical services to those muggles, muggles could had given load of valuables and gold for that trade. But after the statute of secrecy, magical community practically lost it's access to muggle surplus production, and their magical abilities lost value, since all other witch and wizards are able to use magic. What there is to do to make money in such economy? Especially when there's competition from other magical creatures like goblins.

And in economy with low (relative) productivity and innovations (those that would boost productivity), economic growth stagnates and people remain quite poor. Unless, of course, you have "old money", or other valuable assets. If you could, say, provide loads for people or Ministry of Magic, with a generous interest rate, you could get a nice income and huge influence, given how important you would be for financing just about everything. Or if you own land and houses, you could easily generate rent income. But if you lack old money, what then?

Fred and George are actually few of the people who actually create additional value for magical community. They make joke products, sure. But people want those products! They are willing to spend money on those, which allows Fred and George to buy more raw materials, adding demand for those materials, giving producers greater income, making gears of economy spinning. And they could also hire help for their shop, creating job opportunities!

Arguable the fact most wizards and witches can (and probably do) try to do all magical tasks themselves, hinders their economy and keep wages low for most people. If all of them are jacks of all trades and masters of none, there won't be as high specialisation as is in muggle economy. This leads to stagnate growth, low wages and high prices. Muggle societies used to be quite poor too, when just about everything from food to clothes and furnitures were made in homes.

The theory oh "only marauders can see marauders" is a well known theory, but it's not good enough. Yes, it is Lupin seeing Pettigrew in the map, but shortly after Snape (not a marauder) can see Lupin. So not only marauder can see a marauder. I'd say a marauder can be seen by anyone, but on the term that another marauder activated the map.

In the case of Sirius, he blamed himself for the Potters death as he had been the one to suggest Peter so when he was arrested he kept claming he was the one who killed them, so there was no need for further question, or Veriteserum. Even Dumbledore believed him guilty so...

12:25 also Sirius didn't even had a trial. The ministry was eager to arrest as many death eaters as they could. There were witnesses os Sirius killing Peter (they thought they did see it) and  Dumbledore believed him to be the secret keeper. So to prison he goes

Another reason that they weren't their own secret keepers is that if they were no one could tell them when the war was over, and no one could contact them, and sure they could tell people like Vumbledore, but wouldn't they have to leave the house in order to let people in, which is a bad idea, if voldemort could be waiting around in Godrics Hollow.

I always figured the Potter secret keeper thing was either because there were people they wanted told and James couldn't exactly prance around being the one doing so, or it's just culturally expected that it doesn't really matter that much so it's a ceremonial role you give to a friend.

I think a thing that gets glossed over when it comes to the Horcruxes is that the only reason Voldemort can not die, is because a part of his soul remains. But Chamber always gave me the impression that the Horcruxes themselves would be needed if another soul fragment would be damaged beyond repair.
So throwing a Horcrux pebble into the ocean, sure that part would be safe, but also, it could never be used to let him return.

With the map i like to believe that it has something to do with blood, which is why harry sees peter in the movies, that’s just head-cannon to explain why the movies added that weird scene. Another thing with it, is that i think the 4 boys are the only ones who see each other in animal form, and anyone can see them in human, that’s why snape sees lupin on the map when he goes to the shack, and no one saw peter because he was a rat