We hear six speakers of standard English from different areas: Smithfield, Virginia, Green Bay, Wisconsin, Brooklyn, New York, North Andover, Massachusets, and Dallas, Texas. I’ve never heard of some of the dialect features demonstrated in this film, and think they must have been lost by the current day.
It looks like it was live and unrehearsed, and sometimes the guests don’t give the answer the host expects!
Presented by linguist Henry Lee Smith Jr.