In a 1999 interview with Robert Osborne, Rod Steiger said he based the silent scream at the end of the film on the faces in Pablo Picasso's masterpiece "Guernica".
While walking the streets of New York City, Nazerman passes a theater advertising The L-Shaped Room (1962), a film that featured Brock Peters, who plays Rodriguez.
The woman who appears topless for a few moments, thus creating a mainstream movie milestone for that time, is Thelma Oliver.