This and the succeeding episode supposedly take place in a South American country where Joe Mannix has gone to locate someone. When Mannix and Adrianna are moored in a powerboat to have a private conversation, a brief shot of the stern shows that the boat they are using, "The 19th Hole" (itself an unlikely name for a boat in a Latin American country) is actually from the show's real shooting location, the city of Avalon on Catalina Island.
The Grumman Goose Mannix arrived in had an "N" number USA registration. This plane has a maximum range of 640 nautical miles, and it could not have flown to the suggested location over the ocean without refueling. Also, the boats had California "CF" number registrations.