Setting: Idaho.
This is the first of three appearances John Harmon makes in the series, each time playing a different character. The other two appearances occur in Come Watch Me Die (1964) and Death Is the Door Prize (1966).
The truck's license plate, 3T 6241, is an Idaho plate from a non-existent county. There are only 2 counties in the state that begin with the letter T, Teton and Twin Falls.
This is the second of five appearances Harry Townes makes in the series, each time playing a different role.