Number Please/Trivia

Hey, It's That Guy!: Bud Collyer was also hosting To Tell the Truth at this point; Number Please replaced Beat the Clock, which Collyer also hosted, making him one of the few emcees to move from one game to another over the weekend (others include Art James from Blank Check to The Magnificent Marble Machine and Tom Kennedy from 50 Grand Slam to Name That Tune) and one of the fewer to do so with the same production company (another being Bill Cullen from Three On a Match to Winning Streak).
Keep Circulating the Tapes: Only one episode (from May) is known to exist, and has been seen a few times on GSN. In-show references point to being either Wednesday or Thursday.