Lloyd Haynes' movie debut.
Conrad Bain's movie debut.
The Portrait hanging in Commissioner Russell's office is of Theodore Roosevelt, who at one time was New York City Police Commissioner.
The wall calendars, which appear to be prominently placed, show dates beginning with "09 June Friday" through "11 June Sunday". This correlates to year 1967.
Widmark's character was later given his own ongoing television series, in spite of the fact that he appears to die at the end of the original film.