Caroll was appearing on Dinah Shore with Oscar, and Richard Dawson happened to have been the guest before him; at the time, Dawson supposedly wasn't proud of having done Hogan's Heroes, and didn't like being associated with the series, even though it's what made him famous (pre-Match Game and Family Feud)... Caroll thought it would be funny to try to have Oscar banter with him, so he had Oscar say, "So Dawson, how's everything over at Hogan's Heroes? Heh-heh-heh!" Needless to say, Dawson was not impressed, and when he took the floor, neither Caroll nor Oscar got another word in edge wise for the rest of the show.