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Retired, reclusive actress Greta Garbo was such a big fan of the show she actually wrote a fan letter to Paul Lynde in care of the show's taping location at NBC Burbank.

Actor Jack Palance was once caught napping in his square during a taping; he had to be awakened by fellow panelist Michael Landon when a contestant called on him.

Host Peter Marshall had said that most of the episodes were destroyed by NBC. But a Cable TV station found 3,500 episodes (while looking for the TV series Dark Shadows (1966)) and were sent to Game Show Network. Episodes began airing on April 15th, 2002.

Peter Marshall and his partner Tommy Noonan discovered the comedy team of Dan Rowan and Dick Martin, and helped get their careers started by introducing them to their agent. Years later, Tommy Noonan was gravely ill, and Marshall never forgave Rowan for not going to see the person that helped launch their careers. When Marshall was offered The Hollywood Squares (Daytime) (1965) he was initially reluctant to take the job, but accepted the offer, when he was told the producers were going to hire Rowan for the host position if he would not take it.

Celebrities were not required to give the right answers for any questions. They were briefed before each show to help them with possible bluff answers, but were hearing the actual questions for the first time when each show was taped. Certain celebrities were often asked questions pertaining to specific categories. For example, Paul Lynde frequently got loaded questions just so he could come up with an initial funny response.