They showed the house where U2 recorded "War" and the mansion where Led Zeppelin recorded "Stairway to Heaven". They put the drums in the hall, and Roger Waters was high up, at the end of the stairs, playing. It's the song for which Jimmy Page had to "invent" the double-guitar, because he couldn't switch so quickly.
Wonderful moment when Jimmy Page started to play, and the other two just watched in complete awe.
When Jimmy Page put on a vinyl of a very old song ("Rumble"?) he couldn't stop grinning. After hearing it probably a thousand times, he still immensily enjoyed it.
Not the greatest documentary ever, but a fun watch, and one of this films that make you yearn to go away and do something actually creative.