The script held in the Crawford Collection in the AFI Research Collection contains the following character notes (excluding regular characters):
'JAMIE VICKERS. Aged 19, sensitive, likeable, 'going through a phase'. An art student at the Tech. Drives a car.
'TINA NARETTI. 25-26. An attractive Australian girl, married to an Italian. Also doing an Arts course, which is where she met Jamie. A certain sadness about her. She knows her affair with Jamie is ill-fated and can't last, but because of her unhappy marriage, she tries to enjoy it while it does.
'DOMINIC COMISPARI. 45ish. An irrepressible, effervescent, likeable Italian.
'LUCIA. 40-45, Dominic's wife. Large with a large heart.
'ALBERTO. 35-40. Rather simple but good-natured Italian.
'MR GINOTTO 25-35. Italian tram conductor. Likeable, co-operative.
'MR ROMBERG 50-60. Manages the small store next to Naretti's office. Helps Banner in his investigation. Rather precise, dignified person.
'MRS HARRIS. 60-70. A pensioner. Very lively, observant.
'JOHNSON. 30ish, Small time crim. Figures in a car chase and has brief scene with Dwyer. Unintelligent, rough. Should drive well.
'CONSTABLE GREY. 25-30. Has two scenes with Dwyer as his assistant in the Divvy van, which he drives. Half a dozen lines, no emotion.
'PETER NARETTI. Late thirties to forty. Italian. Arrogant, used to manipulating people, including his wife. Ruthless and competent.
'ELLEN VICKERS. Vickers' wife.
'BERGMAN. 45ish. A Private Enquiry Agent. Not a bad bloke, used to the sordid side of life (divorce evidence etc). Looks rather weary, but has a little warmth left.'