The script held in the Crawford Collection in the AFI Research Collection contains the following character notes (excluding regular characters):
'DUDLEY ROBERTS (BROWN) A hermit. Aged about 40. Shortish, perhaps somewhat stout. Wears glasses and a moustache (if possible). Quietly spoken - rather cunning. A sensitive man who considers himself unattractive and unlikeable. Easily offended and can hate with a bitter intensity. Eager to please those he fears or those he's attracted to. Always very serious. Nervous. Has to ride a bicycle.
'BETTY SCOTT A young forty. Rather attractive. Likes herself and competes with her 20 year old daughter. Dresses tastefully and is reasonably intelligent. Well spoken. Has to drive a car.
'KEN ANDERSON Betty's de facto husband. About 40. Well presentable. Good looking. Is the father of Cindy's unborn child. Has little love for Betty. Big of build but weak of spirit. Unemotional. Has to drive a car.
'CINDY SCOTT Aged 20. Same hair colour as mother. Rather unfeeling. Attractive in a cold sort of way. Does nude modelling as a means of making extra money. Bored with her job and life in general. Is killed in second segment. Must wear glasses.
'MARIO Any age. Meek Italian who can't speak English. A night cleaner at Police Headquarters.
'A STRANGER (MALE) Very distinguished company director. About 45-50. Well dressed -well [sic] spoken. "Confident" man of the world. Masks an inner feeling of loneliness and insecurity.
'JACK Shopkeeper. About 40. Pleasant. Average intelligence. Two film scenes onl [sic]
'ERNIE His younger brother. About 30. Rather ordinary. Pleasant enough but not over bright.
'HELEN FOX 28. Inspector Fox's daughter. Attractive very pleasant personality. Qantas Air Hostess.
'UNIFORMED CONSTABLE. Speaking part.
'UNIFORMED POLICEMEN (A & B)'.