Trivia
Curiously Roy Barcroft who played Jake Trueblood in this Have Gun, Will Travel episode of "The Mark of Cain", also played Roy in another episode called "The Mark of Cain" on Gunsmoke 7 years later in 1969.
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Quotes
Dr. Avatar:
Then perhaps you know what these are?
Paladin:
Yes. They are used to measure what Lombroso has termed the stigmata of degeneracy - certain cranial abnormalities, a low sensitivity to pain, primitive instincts found in cannibals, cave dwellers, apes, animals and habitual murderers - in short, the mark of Cain.
Dr. Avatar:
And that is why I have come back to America.
Paladin:
Oh. A shortage of murderers in Europe this year?
Dr. Avatar:
There's never a shortage of wife killers - murders of passion, momentary rage, that sort of thing. My ...
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