The #944 Red & White Cab was also used more than once in "Mission: Impossible". Both shows were produced by Bruce Geller at Desilu / Paramount studios.
In the final scene, as Joe and Kenny are walking along the beach, there is a couple sitting in the sand obviously passing a joint back and forth.
This episode is similar to the 1963 movie "Charade" with Carey Grant and Audrey Hepburn. Audrey Hepburn's character gave a friend's little boy, who likes collecting stamps, a stamp she tore off an envelope of her dead husband.