The picture on Magnum's nightstand is of Tom Selleck's parents, Martha and Robert.
This is Gillian Dobb first appearance in the series in an uncredited role as Nona Barnes, the lady helping Higgins (John Hillerman) set up the croquet game on the beach. She would later go on to have a reoccurring role as Agatha Chumley throughout the series run.
The guest appearance of major film star Vera Miles, a 30-year film veteran, was quite a treat. She would enjoy another 15 years before retiring and, as of 2024, is still with us at the age of 94.