When Chin Ho and Danny Williams bring an assault rifle to Steve McGarrett that they report having found in the room of murdered student Kenji Tatsumo, McGarrett asks if "Che Fong" found any prints on the gun. He asks this even though Harry Endo, who played criminalist Che Fong on the show for years, had already made his final appearance in the role in the season's premiere episode, and all of the forensic scientists with whom the Five-O members interacted in the intervening episodes were women, including two named "Charlie" played by different actresses.