It is revealed that the Governor hired McGarrett in 1959, immediately upon Hawaii's creation as the 50th state.
When Chin and a phone company technician trace the call, it is reused from The Ransom (1970).
This is the third time this same footage was used in an episode, up to this point in the series.
When L.B. Barker jumps onto the balcony and pushes McGarrett into the room where they tumble to the floor together, an obvious double has replaced Jack Lord as the stuntman's hair is a different style.