My take on this would be that every genealogist knows that people get things mixed up; that things you'd think everyone would remember get lost while some things get handed down in surprising detail (for example, in my family there are two distinct versions of the story how my great-grandfather died on his way to church, an event that took place a hundred and two years ago).*
The mutability of memory also came up in Gerald Posner's book on the Kennedy assassination, CASE CLOSED (1993), in which he discusses at one point how witnesses' memories of the event has changed over time.
As an Inklings scholar, of particular interest to me is the collecting, sifting, and evaluating evidence regarding literary events. When did the Inklings first begin to meet? When did Tolkien start THE HOBBIT? When did he finish the earliest draft? When witnesses disagree -- for example, Fr. John and Michael Tolkien directly contradict JRRT's accounts of THE HOBBIT's origins -- how do we decide which is more accurate? When we have evidence that comes from an unreliable source, do we ignore it entirely or use it with caution?
So, it behooves us to have an awareness of the tricks memory plays. I know I have to watch out myself when quoting something somebody told me decades ago. Stories evolve over time, and it's all too easy to embellish and 'improve' a story if you're not careful.
just abandoned: FARHENHEIT FOUR FIFTY-ONE (half-way through). doesn't hold up well on re-reading, all these years later.
*The solution I used was to write down all the information I could when interviewing someone about this or that side of the family, then go back and sort it all out later as best I cd.