The script held in the Crawford Collection in the AFI Research Collection contains the following character notes (excluding regular characters):
'JOHN HARRIS. 40-50. A clerk, a normal man - until an incident with the police causes him to stand up against what he believes to be an injustice which almost becomes an obsession with him. (Must be able to drive).
'MRS HARRIS. A wife, naturally concerned for her husband. Slightly younger than Harris.
'ARTHUR BULL. 30's. A newspaper man; cynical. Sees in Harris a good story. Able to drive a car.
'MAGISTRATE. A kindly man in court, until Harris tests his patience to the full.
'INSPECTOR COUGHLAN. Used to command and obedience. Has 'diplomacy' - he thinks - until he meets Harris.
'MR SANDERS. A friend of Harris, of same age.
'SWIFT. 60's. An inveterate 'toper' up for his 100th conviction for drunkeness [sic].
'POLICE MECHANIC. An expert in his job.
'PRISONER. 30's. Moronic, sub-normal intelligence.
'CLERK OF THE COURT.
'10 EXTRAS. REPORTERS, ONLOOKERS, NEWSCAMERAMEN.'