Peter Falk and Thomas Mitchell both played the character of Columbo. Mitchell played the part on stage, and Falk on television.
This is the second of three appearances Raymond Bailey makes in the series, each time playing Federal DA John Carvell. The other two appearances occur in Portrait of a Thief (1960) and Jack 'Legs' Diamond (1960).
The year following the original broadcast of this episode Thomas Mitchell and Peter Falk appear again together in the movie Pocketful of Miracles (1961). As here, they also play gangsters of a sort, but for laughs.