The car the murderer uses is a rare 1933 Packard Standard Eight Coupe Roadster. In excellent condition in 2020 this car could sell for well over $100,000.
This film was supposed to be the first in a series based on the radio program of the same name that was broadcast from 1934 to 1948. No other films were made, however.
Tony's car is a 1932 Chevrolet Confederate.