Mingo's house was Robin Masters Estate in the later series "Magnum P.I."
When Wallis is shown the video of the daughter who passed away, the photo is one shown in the opening credits of the show, of a Hawaiian girl.
The sailboat used in the episode is a Tahiti ketch, LOA 30 feet. It was popularized as an affordable wooden boat project long before fiberglass, though it's sailing qualities were poor.
Helicopter is a 1947 Bell 47D1 s/n WH5004 (N74119). These differ from the 47G in that they have a single fuel tank rather than the 47G's dual saddle bag style fuel tanks.