The easiest way to debunk the Mandela Effect

Weirdly enough the Mandela aspect of the whole thing is the only part I don't buy, Nelson Mandela was and still is a household name in the UK and Europe and for us there's no way he died prior to 2013, I find it peculiar knowing there are people out there who thought he died much prior to that.

The Berenstain bears thing is odd because I think of it as stein and that box of chocolates line change in Forrest Gump.

I don't like the use of Mandela because I remember when he died. His funeral was even a big deal too. I do understand the meaning behind it though so it's not really anything that needs to be debunked. It's just deja vu

There are Americans out there that can't name a single continent or foreign country. How the fuque are they going to know it was really Shaq, and not Sinbad, that made a genie movie almost thirty years ago.

I don't know that what you suggest really debunks it. The idea of the Mandela Effect is that there are multiple realities, and they either merge together, or people somehow bounce between them, or that we're living in a Matrix-like simulation where certain facts are changed by programmers but the new programming isn't sent to everyone in the simulation, or some other thing along those lines. In such cases, only big changes, like Nelson Mandela's death, a Sinbad movie, the spelling of the title of a children's book, and so on, would come to the attention of the masses. If you personally were certain your brother had died and one day he was alive again, those around you would think you suffered some sort of psychic break, and you might think so too, but it wouldn't make the news. I imagine such things do happen from time to time, but they are treated as individual cases of psychosis. It's when thousands of people misremember a major event that people take notice.

Alternatively, it could be argued that whatever causes the Mandela Effect only happens on a large scale. It's major events that cause some kind of rift in the multiverse, so to speak, and end up branching some people off in a new direction. If someone's sibling dies, tragic though it may be to family and friends, it isn't a powerful enough event to split reality. At the very least one needs Sinbad in a genie costume to generate that sort of cosmic energy.

In any event, I don't buy into it at all, but I don't know that what you brought up is really debunking it. I'm not sure I can debunk it either, other than to say it doesn't fit with anything we know about the working of the universe at this point in time.