It was for those more intimate performances generally that he would bring along a promo film to sort of "introduce" himself to the audience, with the help of some of his friends, and a few of those performers he opened for. Most in the audience obviously knew who he was, but not everyone was as familiar with him. But still, in either case, it was a fun -- if odd -- way to open the evening. And entertaining the crowd was simply what Steve Goodman did.
I found that video.
The quality is a bit scratchy and the sound somewhat muffled, but it's a treat to have. The first few words are cut off, when the "host," Martin Mull says he wants to introduce you to Steve Goodman. The rest is a treat.