The script held in the Crawford Collection in the AFI Research Collection includes the following character notes:
'BARNEY WHITE: Aged about 28-30. Trotting driver. Energetic personality. Reckless gambler. Quick tempered but should be likeable. Has to drive a car.
'JOE SIMPSON: About 60. A quiet, calm, trotting trainer. Been in the game all his life. Lives for his horses. Is concerned when he gets threatening phone calls demanding that he scratch his horse from the Matlock Cup.
'KATE WHITE: Aged about 28. Barney's wife. She should be attractive. Lived in the country all her life. She does not fit in with Barney's world of racing and gambling. She is concerned for Barney and their future together.
'POP THOMPSON: Aged about 70. Kate's father. Retired. Tight with his money, which he has plenty of. Has a dry, impatient attitude towards Barney who he doesn't understand or approve of.
'LENNIE WILLIAMS: Aged about 35. A big heavy. Not very bright. Has to handle himself in a fight. Has to drive a car.
'DARKIE DAVIS: A big time S.P. Bookie. Confident - well dressed. Calm and strong personality. Probably of Italian extraction.
'ROY MARSHALL: Aged about 40-50. Well dressed, successful Melbourne punter and crook. Lennie's boss. He has knocked around and knows what two and two make. Has to drive a car.
'URGER O'BRIEN: About 50-60. A shabbily dressed alcoholic who makes a buck doing small jobs for Darkie Davis, and by keeping his ears open. A rather harmless soul.
'MORRIE: About 60. Joe Simpson's stable hand. Has an easy come easy go nature.
'BARMAN Barman of Matlock pub. Established.
'1ST TROTTING DRIVER: About 40. An experienced driver.
'RACING COMMENTATOR: Male.
'TROTTING DRIVER: Extra.
'BAR EXTRAS (3)'.
Note: The apostrophes in the possessive nouns in this list have been added in pen, not typed.