it is amazing how the mnd absorbs the details of a good performance. You could take any of the handful of great piano concerts I've been to in the past few years and walk through the score with me and I could tell you exactly what the performer was doing, most of the time. I have no idea why I retain such detail in those particular moments.
If Page had such a great memory, how come he always somehow managed to forget to give credit to the guys whose material he was stealing?