Kitty Carlisle's son, Christopher Hart, and Joe Garagiola's son, Joe Garagiola Jr., appeared as decoys on a 1973 segment pretending to be New York undercover policeman. They were disguised so well that neither of their parents recognized them.
During the premier episode of the final season, Garry Moore acted as host. However at the end of that episode, Moore announced that he was retiring as host and handed over the reigns to then panelist Joe Garagiola.
Frank Abagnale Jr., the subject of the film Catch Me If You Can (2002), was once a contestant on the show. In fact, the opening scene of that film shows his appearance after his release from prison.
When the show's creators Mark Goodson and Bill Todman were planning on bringing the show back on television in syndication, they planned on bringing Bud Collyer back as host. However, Collyer, citing health reasons, declined. Ironically, the day the show premiered in most markets, September 9, 1969, Collyer passed away due to circulatory disease.