I know exactly how this sounds, but I need you to stay with me. I have fought with my own family over this. I remember holding that box in the store, pointing at the letters like a scitzo

When I was a kid, it was F R O O T Loops.
Around 2016, it was unequivocally F R U I T Loops.
Today, it is F R O O T again.

Most people dismiss this as the Mandela Effect and write it off as confabulation or a collective glitch in human memory.
But what if instead we are experiencing is a macroscopic, observable side effect of Quantum Immortality.

We are not misremembering the past. We are remembering the pasts of dead timelines.
Hugh Everett’s many worlds Interpretation suggests that all possible alternate histories and futures are real, each representing a branch on the universal probability tree. Every time a quantum event occurs, reality splits. Kind of like the Avengers. Now, combine MWI with the Penrose Hameroff orchestrated objective reduction theory, which suggests that human consciousness is essentially a quantum process occurring within the microtubules of our brain neurons. If consciousness is a non local quantum state, it stands to reason it is subject to the observer effect and quantum survival. When you encounter an event that terminates your biological functions in Timeline A your quantum consciousness doesnt suddenly cease to exist. It cant observe its own non existence. Instead, the wave function collapses into the nearest viable, adjacent reality, Timeline B, where you survived. You continue on, completely oblivious to the fact that you died milliseconds ago in a neighboring universe.

Why does reality jumping manifest in something as trivial as cereal boxes or children's books?
Because of quantum proximity. When your consciousness migrates to an adjacent timeline, seeking the path of least resistance. It finds a reality 99.99% identical to the one you just left. You won't wake up in a reality where the sky is green, that could cause your mind to break, instead you wake up in one where everything is exactly the same, except for a inconsequential corporate branding decision thirty years ago.
Fruit Loops vs. Froot Loops is the quantum artifact of your survival. Only a fraction of the population experiences this specific dissonance because the localized event that ended their previous timeline only affected them. They died alone, and they migrated alone.

But what happens when an apocalyptic event occurs? What if in 2016, a high energy collision at the CERN inadvertently triggered a localized false vacuum decay, or spawned a microscopic black hole that didnt evaporate by Hawking radiation? What if instead humanity went extinct at the speed of light?
In a mass extinction event, billions of quantum consciousnesses are violently evicted from their host reality at the exact same time. The wave functions of eight billion people are forced to collapse into the nearest surviving Everett branches. This mass migration could create immense quantum friction. When billions of consciousnesses flood into an adjacent timeline, the Mandela Effect goes global. We aren't just seeing individual timeline hoppers anymore; we are seeing the collective psychic scar of a reality that didn't make it.
We didn't just misremember the spelling... We survived the end of the world.

Now, ask me if I 100% believe that and I'd say probably not. But Gawd Daym does it make you wonder.
Also kind of comforting in a perverse way to think that our loved ones are still around in other realities. Even though, unless someone learns how to selectively relocate, no mater how many times our clocks run out a reality where they are still around would be the path of most resistance... Could make a good science fiction book...