Woody Allen's comedy play 'Don't Drink the Water' was still running at the Morosco Theatre on Broadway. The production would close on April 20, 1968, after 598 performances, and it was eventually adapted into 'Don't Drink the Water (1969)' and 'Don't Drink the Water (1994)'.
Martin Gabel and Tony Randall were the two people who appeared the most as guest panelists during the show's run, with 112 and 62 credits each, respectively.