I've occasionally had visions of the future. I've seen a murder suicide of a family of four a few months ahead of time. I've had a dream of the death of a relative the night they died. Other more minor stuff, when I was younger I'd have deja vu of the movements of classmates in high school (so and so comes over to say something next). My memories of the timing of the death of some musicians differs from what is historical. (John Lennon 1973 vrs 1980, George Harrison 1978 vrs 2001, Grace Slick 1984 vrs alive). I occasionally remember dreams from a long time ago, but they seem symbolic more than anything (it's not what I would call a flashback).

I wonder sometimes if there are multiple futures and multiple pasts, and that only the present is fixed. Essentially if something in the distant past changes, then current people would remember learning about it from books and school, even if it was a changed timeline. I forget the author's name, but someone correlated the lengths of kings reigns and events to show that a major section of dark age history was likely forged as a copy from previous history.