A few years ago, as part of the Southport Jazz Festival in the UK, Paul Balmer (the producer of the documentary) gave a talk about the making of the film. Bass player Coleridge Goode ( who recorded with Stephane and Django in the 1940s) was also on hand and added some personal memories.
Paul Balmer also played some very passable jazz guitar at a jam session.
I can recommend Paul's biographical book on Stephane.