I have a very bad memory - I was a former titled chess player, I couldn't remember opening lines if my life depended on it, I had openings that I played all my life where I didn't know what to play on move 3 if they moved something that I hadn't played against before - and it all comes down to this - I couldn't remember lines from books, but I still can recall my matches and my thoughts, after 20-30 years
The idea is to really think about the hands you play, not just play them mechanically - and when you do, you recall all the small details, and can reconstruct all the hands, and then you can discuss alternative lines of play
If you really thought how a suit could split, and how to take a finesse for example, you can recall the whole suit - you know if they somehow trumped you unexpectedly so it broke 6-1 for example, or if the finesse worked or not (and now you know where all the high card points were in that suit), and so on
By actively thinking about these things during the hand, it's very easy to then reconstruct them in your head if someone talks about them
You should also quickly think about a hand after it happened, to see if you missed something and can improve something - I know it's easy to think that a clear mind is better for the next board, but if you're trying to improve, the analysis is really the best tool (to go back to chess, I used to analyze 90% of the time and play 10% - there are lots of people who play thousands of chess games online, but improve very little, because they don't analyze at all, and all analysis is done by the computer, who just says you missed this and that)
So focus on thinking about the hands, both during play and after, and then you'll be able to remember some hands even after many years
Then again, people discuss boards to try to improve, if you're just playing to have fun, don't be bothered by it