The JFK Mandela effect change is particularly unsettling.
Many conspiracy aficionados have devoted like hundreds of hours of their lives to studying the the JFK assassination and many of them also remember it being 4 people.

I’d like to hear from one of the documentary film makers or authors of books on the JFK assassination and find out how many of them remember it being 4 people instead of 6.
If you believe you’re remembering correctly contact the authors of these books and survey them then buy their books and see if the books say 4 people or 6 people.
http://amzn.to/2fIsEqP
If the books say something different than their authors do THAT would be notable.
Most of the other Mandela effects can be easily discounted as people having poor memories of old movies that they weren’t really paying much attention to anyways…