The Anderson Estate, familiar to viewers of Magnum PI as the Robin Masters Estate, returns for another H5O appearance; this time it is the residence of arms dealer Ben Cunningham.
This tale includes footage which first appeared in 'The Ransom" earlier in the season showing a telephone technician manually tracing a telephone call through racks of switching relays.
This story involves people from the foreign country of "Malanesia" (as identified by the sign outside the Counsel's building). There is no actual country with that name. There is a loose collection of islands NE of Australia that includes New Guinea and the Solomons called "Melanesia". This name is for geographical purposes only as the islands themselves are politically independent of each other.
When Chin visits the phone company to trace the call from the kidnappers, the footage used is from episode 3.6 ("The Ransom").