I think it is true that if you just call, some people behind you might 3-bet. But in the situation in the video, there were only 2 people left to act, and 1 of them was a nit. Even solid regulars won't 3-bet all the time. And if they do, then the way you can exploit them is to just call someone's open raise with all your JJ+/AK and when the reg 3-bets behind you, then you can 4-bet him. But honestly, as much as I talk about 3betting as a bluff and capitalizing on dead money, I rarely am 3betting more than about a 12% range at most, even in very favorable situations. And I don't think other regs can really 3bet much more than that, either (except if they are playing heads-up, or in some weird situation).

If everyone calls and the action is on the last limper, then I think he should call as well. His odds are so great at that point that he can pretty much call with any two cards. Maybe fold offsuit disconnected stuff like T2o or 82o, if he has them in his range. He will be closing the action and had decent position. His error was limping in to begin with, but with such a small raise size, I think it would be profitable to call when it gets back to him.

I disagree that any stats people have on you are useless because you are inconsistent. You still have frequencies of actions, which is what HUDs tell people about. I think shoving all in with some marginal hand is not very good there. It's a very weird move that people will remember for a while, so you probably wouldn't be able to do it again at the same table. I don't think it's really profitable even the first time you do it, either. You're going to risk 100 bb to win ~15. And the original raiser can still act and maybe has a monster himself.

Also, I strongly caution you against having an early limping range. 90%+ of the time, it is wrong to limp in early position. I don't think the tables are passive enough, even in microstakes, that you can open-limp some stuff like A2s or 87s. I think the almost surely have to raise or fold if you are the first one in the pot. An exception might be if there are some really aggressive players that you can exploit with a limp-reraise. But that's a rare situation.

You are right that is is correct to play face-up against inexperienced players. They are not trying to exploit you; mostly they just are worried about their own cards.