It was Abner Kravitz.
He was a reliable character actor and worked with a lot of people, I think he mainly worked at Warner Brothers.
Gladys Kravitz: “She ran into the wall...a normal person would have just thought it was an accident.”
Abner Kravitz: “But what did *you* think it was, Gladys?”
The first thing that crossed my mind when Dick Sargent replaced Dick York was Sergeant York.
The end of the line...
What an odd coincidence!