Cricket sings "(Why Did I Tell You I Was Going To) Shanghai," a standard written by Bob Hilliaed and Milton De Lugg that had been a big hit for Doris Day in 1951.
Adaptation of the novel of the same name written by Robert Colby, first published in February 1959 by Wideside Press.
The opening shot features a neon sign for a restaurant named Wo Fat. This is not a coincidence--it was an actual restaurant and "Hawaii Five-O" creator Leonard Freeman used it as the name of the show's popular villain.