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Fake Memories talks about the Mandela Effect. See also Ripple-Effect-Proof Memory.
Edited by KingOfStickersThere's also Rouge Angles of Satin for common mixups of the sort that make most people misremember the spelling of Berenstain- the right way to spell it just plain looks wrong. Malaproper and Spoonerisms also lead to this sort of false memory, as can the "write the word circle 30 times" form of Centipede's Dilemma.
Beam Me Up, Scotty! and Common Knowledge are also closely related, where the things that everyone remembers never actually happened.
Edited by Scorpion451

Is there a Trivia or YMMV trope for the Mandela Effect? I ask as it seems the Berenstain Bears have changed for the second time and it reminded me of it. (For a reference, my earliest memories were Stain, then I watched youtube videos saying it was always Stein, but now it's back to Stain and I'm very confused...)