He played several tunes acoustically but Layla was not one of them. The acoustic stuff he played were tracks that were originally recorded acoustically.
THE ROAD TO ESCONDIDO - TRAILERS
Some EC with JJCale videos at the bottom of page
http://www.whereseric.com/news/2006/10/clapton-cale-road-to-escondido-online-premiere-rhapsody.html