- Telly Savalas was originally cast as Luke, but was in Europe and refused to fly. Not able to wait for a boat journey, the producers cast 'Newman, Paul' instead.
- Bette Davis was first offered the role of Luke's mother, but refused the bit part.
- Luke's prison number (37) is a reference to the Bible - Luke 1:37.
- In the last scene the lights in the traffic signals are reversed: red on the bottom, green on top. Clearly it was the director's intent to defy authority.
- Lalo Schifrin's theme music was later used by the ABC-owned stations as the theme music to their nightly newscasts.
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