I took a look at the youtube channel of the video that John posted in the recent Happy B-Day Paul Johnson thread and came across some other surf related videos.
One is of 3 Balls of Fire with Dusty on drums and I believe Sam on bass. Another is Man or Astroman? from 1995 at Rhino records.
There is also an interview with Brian Wilson and some videos of Southern Culture on the Skids (one from 1993). Looks to have a lot of gems.
-Darren