Re: TOS' incorrect world war I/II dead
And in one episode (Tomorrow is Yesterday? Assignment: Earth? City on the Edge of Forever?), Spock makes a comment, "Records from that period in your Earth's history are fragmentary."
Lots of history might have been lost due to the hypothetical World War III.
Dr. Howard, Dr. Fine, Dr. Howard: For duty and humanity! --Men in Black (1934)