I don't have any clips, but it's fun to see Ian Wolfe (Septimus and Mr. Atoz) in WKRP in Cincinnati, as Mama Carlson's butler, Hirsch. He has a deadpan comedic delivery, plus great jabbing lines, that help him steal almost every scene he's in.
Or John Hoyt (Dr Boyce) in many episodes of HOGAN'S HEROES - almost always as a Nazi general.
And speaking of The Cage
, There are a couple of episodes of the the 60's version of DRAGNET where Peter (Jose Tyler) Duryea shows up.
Then there's the classic HAZEL with James Doohan...and the BEWITCHED hes in also.