I wached a show on this recently. Everytime we remember something that has happened it's a little different than how it actually happened. You add time, years to those memories and we can get pretty far off from what actually went down.
There is that mate but I think he was referring to actual false memories. Things that never were. There's a word for it I can't remember.
As an example. You know how Mickey mouse always wore shorts with braces.
Sure now that I've mentioned it you can remember him pulling on his braces..
Well go Google an image of Mickey mouse...
It obviously isn't the same for everyone but a lot of people will remember him wearing braces. It's just a wired phenomena off mass effected, false memories.
I've had a long day and that was the first e.g. I thought of but there's lots of them.
Fuck I wish I could remember what it's called lol.