The Mandela Effect does not exist in the manner you're describing, and by priming your audience to expect a specific false memory you're tainting the data from any responses you get.
People wouldn't have the Berenstain/Bernstein thing mixed up in their heads so much if the conversation about it was always phrased as "Who are the authors of that old children's picture book series with the bears?" instead of adding doubt with "Do you remember the authors as Berenstain or Bernstein?"
I've heard of lab-grown flesh cloned from a burn victim's own flesh replacing the need for an invasive skin graft retrieval, and a gold nanoparticle mixture placed into an old spinal cord injury to cause microscopic damage and force the body to resume healing the severed nerves. Those are the big two I like to talk about. I'm optimistic about things like whole working artificial organs in the next 50 years