Sarah commented about stories that conflict with historical events and she is exactly right. Personal stories are basically true, even when a few facts get jumbled. We need to keep in mind that the version of the story we are hearing (or telling) is one person's perception of what happened.
Any police officer can tell you how a room full of potential witnesses all see a slightly (or hugely) different view of what happened. With my six brothers and sisters, we all remember events just a bit differently. Rather than causing conflict, I like to think of it as seeing the world thru multiple lenses. Of course, that doesn't help at all in the courtroom.
One person may view the world with rose-colored glasses, while others see the glass as half full or half empty. Regardless of the bare facts, passing time tends to fade our memories. That's when a little research can help to fill in the gaps and put things into a more realistic perspective.