Link for Mandela effect examples : https://www.goodhousekeeping.com/life/entertainment/g28438966/mandela-effect-examples/

The Mandela Effect refers to a situation in which a large mass of people believes that an event occurred when it did not

A false memory is a psychological phenomenon where a person recalls something that did not happen or that something happened differently from the way it actually happened.

A parallel universe, also known as a parallel dimension, alternate universe or alternate reality, is a hypothetical self-contained plane of existence, co-existing with one’s own.