Mary's car is a 1947 Ford convertible. Willy and Barney had a 1949 Plymouth Special Deluxe two-door sedan.
William Talman's acting career included a lot of roles similar to this one, i.e., playing a crook or a heavy of some sort. His most famous role, which he played for nine seasons on T.V., was of a law-abiding nature: District Attorney Hamilton Burger on Perry Mason (1957).