The final scene where the singer dedicates a song to her manager was filmed in Hilo at the end of a real-life Yvonne Elliman concert (she did these episodes while on tour in Hawaii), with the real-life concert audience sticking around to see her and Jack Lord in a rare public appearance.
In this episode McGarrett tells that when he was thirteen years old, his father, age forty two, was run over and killed by a robber making a get-away. McGarrett's mother worked for the next twenty years to " bring us up and educate us". This indicates he has at least one sibling, likely the sister mentioned years earlier. It is also one of the only times in the series McGarrett gets choked up as he tells a gangster it's why he wanted to be a cop.