I've always found two things interesting about memory. First, it often seems many more memories can be stored than recalled. This becomes apparent when you can't remember something to the point of being certain you've forgotten, only to later recall what you were trying to remember. (My definition of a good trivia question is one you can't answer until you're told the answer and you realize you knew all along.) And of course people who have the ability to apparently remember everything indicate memory capacity can be enormous.

Second, I've often thought I can correctly remember a scene from a movie or TV show I saw decades ago, but when I see it again I realize I got a tremendous number of details wrong, indicating that particular stored memory is very general in nature and not accurate at all.