Apart from cringing as you realise you actually sound nothing like you thought! You notice all the things that weren't right on the day that you had been completely oblivious to! Like the harpist not playing the music you requested during the signing of the register (my absolute favourite piece of classical music) and only playing a few seconds of the exit piece and immediately launching into something else as soon as the two of us were out of sight.
I didn't notice this at all at the time!