This is the only episode that has Inspector Erskine working with a female FBI Agent (Mary Frann as S.A. Pat Driscoll).
Warner Bros. Studios did a lot of gangster movies back in the 1930's. The FBI was also produced by Warner Bros. Studios as well.
Nancy Wilson who guest stars in this episode is also a singer and actress in real life.
In the end credits. Inspector Erskine would drive just one car. The vehicle was a 1974 Ford Grand Torino Brougham 2-door hardtop coupe.