I just heard about the Mandela effect a couple of years back. What I found strange about it was that I actually remember when he was released, so I know that he didn't die in the 90's. Anyhow, after hearing about it, what I've chalked it up to is that with the advent of the internet and all, just as it is easy to access information, it is just as easy to access misinformation. That, and possibly someone is confusing him with someone else.