I doubt it was taped or filmed. It was on the Dick Whittinghill Show in Los Angeles which was an afternoon
talk show. There are probably other interviews from that time because 20 Million Miles was given more publicity than most
monster films.
A similar interview was done for Jack the Giant Killer featuring the Cormoran and Harpy puppets on the Skipper Frank cartoon show.
I assume there is still film of the Warner Bros. short showing the making of The Animal World which was broadcast in 1956
on the Warner Bros. Presents show on television.
I saw all three of these and have never forgotten them.