From what I understand, when something changes, no traces of the previous version exist, only memories (and in some cases, "derivatives" i.e., there are references to "Berenstein" and "Sex In The City" in articles).
Like @brian-imhoff I don't see any benefit from attacking people who might deny it -- I have experienced it, I know that it is real for me for some of the items, and there aren't any items that I mis-remember in a way that others don't.
In other words, I don't recall it being spelled "Berenstone", and neither does anybody else who mis-remembers it. I think this point is salient. Cheers!
The reason I know it has always been Sex And The City; is I remember a conversation years ago with a friend, who said; "...everybody thinks it Sex In The City, but it's not, it's Sex And The City."
I was like; "oh really? I thought it was in, as well..."
Cg