Mr. Jan Diederik Medendorp, the second contestant, had come from The Netherlands especially for the reconstruction of the 'De Zwaan' windmill, which was formally dedicated in April 1965 at the city of Holland, Michigan.
Marian Anderson had just finished her farewell international tour on April 18, 1965 (same date as this episode), with a performance at Carnegie Hall, after which she retired from singing aged 68.
The Houston Astrodome had been inaugurated earlier, on April 9, 1965, with an exhibition game between the Houston Astros and the New York Yankees to a sold-out crowd of 47,879 spectators.