So basically, this mandela effect is based on this:
http://www.theinvisiblegorilla.com/gorilla_experiment.html

Here is your explanation.

No, dimensions editing or Cern experiments or anything of this sort.
The US was still on the moon. No conspiracy of any sort.

Reminds me of that episode of Star Trek when they make a holodeck inside the holodeck raising questions as to if they were still in the holodeck at the end and how one would define reality versus a simulation.

My thinking is people often prescribe extraordinary claims to matters because it makes their world seem more grandiose than it is. We hate to admit that our perception and memory are often simply flawed.

The only story about the so-called "Mandela effect" is that some ignorant people got Mandela mixed up with another black guy dead in the 80s and were surprised to hear about him again when he really died. You never told yourself "Oh, I thought he was dead already" when you heard about the death of a celebrity? It's the same thing, and conspiracy theorists managed to invent something out of this.

Nothing to do with the multiple worlds theory, the CERN or anything. If you pay attention, you'll see that usually people believing in crazy theories about CERN are people not understanding anything about science or what the CERN is doing. Basically, if your neighbor is doing something you don't understand, then (s)he must be an evil witch involved in some evil scheme, no doubt about that. Just as interesting as the flat Earth people...

"Ship in a Bottle" is the 138th episode of the television series Star Trek: The Next Generation. The 12th episode of the sixth season.

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If you have Netflix like I do there are plenty of great episodes to watch with interesting ideas.

Earth is full of "Maple Streets" where the worst enemy is fear and paranoia.

"The tools of conquest do not necessarily come with bombs and explosions and fallout. There are weapons that are simply thoughts, attitudes, prejudices – to be found only in the minds of men. For the record, prejudices can kill – and suspicion can destroy – and a thoughtless frightened search for a scapegoat has a fallout all of its own – for the children – and the children yet unborn."

Yes the future can change the past but the question here is whether you can parse reality from perception. For most people it is indeed on in the same. There are no guarantees that your perception is an accurate picture of reality but for the observer it is real. Simply looking at something from a different angle can reveal things about your reality that change your perception.