The members of the Yarra Central Criminal Investigation Branch are assigned new ranks without any fanfare in this episode. These rank changes were in line with changes made at the time by Victoria Police, among which were the abolition of the rank of Detective and the creation of the new rank of Detective Senior Sergeant. Some of the characters of the other police dramas being produced by Crawford Productions at the time, Homicide (1964) and Matlock Police (1971), underwent similar rank changes around the same time.