This story introduces yet another half-brother of Higgins, Don Luis Mongueo. Other half-brothers who appeared in earlier stories include: a Elmo Ziller (a Texan) and Father Paddy McGuinness (Irish). Higgins also mentioned two other half-brothers, Soo Ling (Chinese) and Noomba (African), and a sister, Elizabeth Whitefeather (Native American). In all this adds up to six half-siblings.
Features Higgins' father, Albert Stanley Higgins.
In this story Magnum has plans to attend a concert. The concert was by pianist Dave Brubeck (1920-2012), a jazz pianist known for his unusual time signatures and for playing in an intimate group of piano, sax, and drums, and occasionally with upright bass. He is best known for the instrumental piece composed by his musical partner, saxophonist Paul Desmond, named Take Five.
People in Waikiki are so enthralled by the riveting excitement of a chess tournament happening indoors that they leave the beach, surfing and shopping in order to gather around several televisions set up at outdoor bars and catch every intense moment of the action going on.