Watched bits and pieces of CBS at 75 tonight.
John Harkins (Horace Gladstone) showed up in a scene from Mary Tyler Moore as the priest as they bid a fond farewell to Chuckles.
Dennis Patrick (Paul Stoddard) showed up in a series of clips from Dallas centering on the Who Shot JR? storyline.
No sign of John Karlen at the table where the cast of Cagney and Lacey was seated, but I wasn't watching very closely, and I don't know what clip(s) were featured.
David Selby wasn't in the clip from Falcon Crest. I'm never watching CBS again.