If I watch a Discovery channel show about Egyptian Pyramids and the show were to play again 30 minutes later. I could pretty much watch it again as though it was the first time. I love those shows but retain nothing beyond some visuals.
I often forget useful things. I've probably put up drywall in over a dozen houses in my life..but I couldn't possibly do it on my own because I don't remember any of the steps to doing it right. Same applies to any number of crafty tasks. I've aided in the building of several decks, garages, sheds, roofing...yet don't actually know the first thing about any of it.
I do however remember useless things like the punchout password to get to Mike Tyson, despite not used that password since I was a kid (007 373 5963). I know that number but I can't tell you my home phone number or social without looking those up in my wallet. Go memory!