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what about mirror mirror on the wall?

This is the one that gets me too. Taking German in high school and learning about the pronunciation of ie vs ei, I remembering looking at my sister's books and using that bit of knowledge to pronounce the bears' last name.

There is also Smokey Bear or Smokey the Bear variation

Oh my! I remember that as Smokey the Bear without a doubt.

You definitely heard the book read by people used to "stein" names way before that.

Yup! And it's the only Mandela effect that I can't just brush away to faulty memory.

what about the changes to the skull or positions of some organs

I haven't looked into that. What's different?