Yes,

That is Jesse Fuller the guy who wrote the song that Jack is singing "San Francisco Bay". Jesse was a one man band playing Guitar, harmonica, high hat cymbal and a self constructed foot operated bass which he called a Footdella. We have photographs of him playing at the 100 Club in London in the 60's. My workmate and very good friend George Webb escorted him around when he came over on tour and had a great fund of Jese Fuller stories.