The script held in the Crawford Collection in the AFI Research Collection contains the following character notes (excluding regular characters):
'HORRIE ALLEN: Late 30s - mid 40s. A big, innocent, likeable, naive, dunder-pated bear of a man. Loves Nancy, feels responsible for Charlie.
'CHARLIE ALLEN: Late 30s - early 40s. Horrie's younger brother. A smooth-talking, opportunistic, manipulating conman. Not very good at it, but thinks he's smart. Uses Horrie, but cares for him in a rough sort of way. Resents Nancy's interference. A likeable rogue until he takes things too far. Short and slight build unlike his brother. Tries to be the flashy dresser.
'NANCY HOGG: Late 30s - mid 40s. Long-suffering, mothering, but with a sense of humour and quite a bit of spirit. Loves Horrie, but is deeply hurt by what transpires.
'JACK DREWSON: Late 30s - early forties. Slick, good with words, tries to be the well-groomed, erudite, man of business. Really a cheap crook. Like a snake, dangerous when roused.
'AUBREY: A short, tubby man. Thick. Drewson's "muscle".
'RACECALLER: Voice-over only.
'BARMAN:
'LADY: Late 50s. Butch, aggressive.
'DERO: No dialogue.
'TAXI DRIVER: Actual.
'SERVICE STATION ATTENDANT #1: No dialogue.
'SERVICE STATION ATTENDANT #2: Young, obnoxiously eager.'