False or implanted memories are quiet common, people's recollection of an event can distort over time. Another event can influence your memory and warp and change it, something on a talk show or tv cartoon a comedy standup sketch, a film referencing a cultural event can add to the fake memory syndrome among many people. Although I admit some of the Mandela Effect stuff I did sometimes find kind of freaky, I know one person, a friend lets say who got totally freaked out by the "The Berenstein Bears" and "the Berenstain Bears." It seemed like a really stupid thing to freak out over and it didn't bother me since I don't really remember them but they were almost convinced this was proof of anotehr dimension or aliens kidnapping people and taking them to another reality or some dumb crap, this same friend would have had a lot of crap in their system like booze or weed or sleeping pills, listeing to Joe Rogan and Coast to Coast Am type stuff so they might not be the type of person that had a grip on reality during the best of times.