This episode is based on a real case in which a man fooled an official of a company printing the currency of a South American country into printing bills for his own personal use. The man was not a national of said country, though, and his plan was to inflate the currency of a neighboring country.
Although officially listed on the program credits as playing the Postman, Denis Holmes also plays the much larger role of the Police Sergeant.
The final screen appearance for Helena Pickard who died almost 5 months before the episode was broadcast.