The script held in the Crawford Collection in the AFI Research Collection contains the following character notes (excluding regular characters):
'TIMMY SAVAGE: (18) Very likeable lad. Must be proficient trailbike rider.
'BONNY PICKETT: (14) Wealthy young schoolgirl who is shamelessly in love with Timmy.
'MRS. PICKETT: Bonny's mother. Fashionable, attractive, shrewish. Should drive.
'MR. PICKETT: Bonny's father. Alleged to be a Melbourne gangster, but we'll suspect differently after we meet him.
'SAVAGE: Timmy's alcoholic father.
'AIR AMBULANCE ATTENDANTS: Actual.'