If I remember correctly, there's a bit where he detunes the E for one riff then retunes it for the next without cheating by using a Banjo tuner or anything. Awesome!
Up to about 38 I knew every single one. Then I knew one in three to about 50. After that it went down to one in five and after 70 one in ten. After about 85, I only knew one single band and didn't recognise a single riff.