Steve McGarrett's final words to his Five-0 team "A hui hou" translates to: "Until {we} meet again."
Although this is the final episode of the series, some characters that originated in this show will appear in other series from the same shared universe, most obviously "Magnum P.I.". Additionally, this episode implies a potential "office dynamic" for how the task force would continue without Steve.
William Sadler's 11th appearance as McGarrett Sr. And his first since season 5
This episode is the Series Finale.
Elements of this episode contain links to various parts of the overall story arc, from the very first episode onwards, which some casual viewers may not recall. These become more obvious after binge watching the entire series in order.