- The screenplay was started by Harlan Ellison, who wrote the novella on which it is based. Ellison encountered writer's block, and so producer Alvy Moore and L.Q. Jones took over and wrote the script. Ellison saw nothing of the film until the premiere, at which he was sitting next to Moore. Ellison praised the film, to the relief of Moore, but there are rumours that Ellison later condemned the film.
- Tim McIntire (who did the voice of "Blood") sang the main title song, "A Boy And His Dog."
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