Memories made are highly subjective as you can only remember things you've perceived, and our sense of perception is highly distorted.

Some people have a better memory than others, and most people prioritize what they remember in significantly different ways. They may be good with names, bad with faces, or vice-versa. They might not remember particular dates, but will remember the weather.

Even people with a very good photographic memory might be blind to things. What song was playing there? What did they say to you? Did the place smell like anything in particular? What were you feeling at the time? What was the temperature like? Was there a draft? It's rare to find someone who's paying attention to everything, all the time, and taking notes mentally.