Trivia: Max von Sydow is only 11 years older than Joanna Miles in real life, despite portraying her father.
Trivia: Science-fiction author Harlan Ellison wrote the original novella "A Boy and His Dog" in 1969, and director L.Q. Jones wanted Ellison to also write the screenplay for this 1975 film. When it became apparent that Ellison could not provide a screenplay (due to "writer's block"), Jones co-wrote the screenplay. In a DVD commentary decades later, Jones said that Ellison was pleased with the finished screenplay and movie except for certain dialogue. Ellison was especially offended by the last line of the movie, spoken by the telepathic dog, Blood: "Well, I'd say she certainly had marvelous judgment, Albert, if not particularly good taste." (This grisly line alluded to Vic and Blood eating Quilla June Holmes, the female love interest, in an act that happens off-camera.) Harlan Ellison said it was a "moronic, hateful, chauvinist last line, which I despise."