Final acting role of Than Wyenn, whose acting career began in 1949. Wyenn would live almost another 30 years until 2015, when he passed away at age 95.
The "L.C." zip code on the passport paper the hooker looks at is 91605. This is an actual zip code for North Hollywood in Los Angeles.
Morgan Woodward also guest starred on Star Trek (1966) with William Shatner twice. In Dagger of the Mind (1966) he played a penal colony escapee, and in The Omega Glory (1968) a starship Captain gone bad.