I love seeing this video each and every time - and very funny at the end, with Hank walking out and staring at Cliff with a bemused look on his face! Great stuff.
It also shows that, though sloppy (probably due to insufficient practice and experience), Cllif was actually already then a pretty decent guitarist, and did a fine job emulating Hank. He was most certainly good enough to play some additional rhythm guitar on a few those early tracks, Sleepwalk, Gonzales, Big Boy, etc....
