The music played on the radio here is all cover versions by anonymous studio musicians and not by the original artists. This is because licensing rights to the song were not secured before the show went to syndication. Even though original songs may have been cleared for the original broadcast they rarely show up in syndication of show from Magnum's time frame. Nowadays this isn't a problem as shows have much higher budgets to pay for them.
Second appearance of Gretchen Corbett, who had a role as Jim's lawyer in The Rockford Files, this show's spiritual predecessor.
When Holley Hudson hugs Don Cassidy her fingernails are short. Later, on Kaheo Point, when Holley points and cocks the revolver at Cassidy, the hand holding the gun has long fingernails.