The part of "Kate Blake" is played by actress Jeanette Nolan, the wife of John McIntire who plays "Lt. Daniel Muldoon".
The prop newspaper that George Blake reads from about the murder of his mistress, is a reworked version of a prop newspaper first prepared for "North By Northwest" which wouldn't be released for another four months. Underneath the caption "Object of Manhunt" is a photograph of Cary Grant holding the knife from the UN murder sequence of that movie.
During the 1940's, the two very different kind of actors, usually straight-laced Kent Smith and usually villain-playing Lawrence Tierney were signed to RKO Pictures.
One of several TV episodes featuring Lawrence Tierney from the late fifties and early sixties, who had lost his movie career through drunken arrests. With every TV appearance, also including another killer role in the Charles Bronson series Man with a Camera, he'd call these one-off guest spots "comebacks".