Wow, that's usefully timeline-affirming (for me): many thanks! Aside from the impermanent mutability of Wikipedia, of course.
Which suddenly makes me realise something massively-obvious in respect of the Mandela Effect as a putative phenomenon: in addition to it apparently having only emerged as a sub-collective set of shared suspicions (courtesy of the discursive medium that is the internet), and its majoring focus upon 'modern' media works of artifice or reportagé: do we have any level of certainty regarding the earliest
pre Nelson Mandela era 'Mandela Effect' manifestation? In circumstances much more neoclassically-profound than an android's shin or a Bond beauty's braces?
In the pre-WWW (well, also pre-news media) era there could be said to have been such a thing as
experts. Individuals who (independently, and referentially) knew massive amounts of information on certain areas of focus. These point-sources of reference were (I believe the old word was...)
trusted but not necessarily tapped for their content: unless in response to a context of informative need.
Nowadays, the true expert is (to a meaningful approximation) dead. Instead we are all simply ignorant conduits of postulated semi-single-source expertise,
not randomly-garnered from tribal mythshares in smoky bars, or keenly absorbed at the knees of grandmothers.
We are (to a big extent) no longer creating insular syntheses of the information sets we acquire during segments our lives; there is the end of analysis & derivative conclusion /critique. We all know what we think, and remember, because we've read it today on the Internet.
Maybe I shall try to chew some more offline ontological bitter-pills later...