The nine "mystery guests" were the co-stars from the Broadway revival of "Dinner at Eight" which would open on the Tuesday after this broadcast, September 27, 1966, at the Alvin Theatre. Panelist Arlene Francis was the 10th star of that play. The comedy ran for 127 total performances, closing on January 14, 1967.
First contestant Howard Pomerantz's brother Myron had previously appeared on episode 'Anthony Perkins (2) (1963)', representing the same powder puffs manufacturing family business. Howard later became the company's president (Victoria Vogue, Inc.).