Actor John Harmon plays an old comedian named Sonny in the show, but in the credits his character is named Ira.
Murray tries to point how how Felix and Oscar are acting old before their time, so he shows them he can jump the two stairs between the living room and the front door landing. As he moves from the middle of the room to make his jump toward the door, a clear shadow of the boom microphone is seen on the wall as it moves toward the door to follow Murray.