War of the Coprophages featured insect-like robots designed by roboticist and author Rodney Brooks. Morgan was also inspired by Orson Welles's 1938 radio broadcast of H.G. Wells's book "The War of the Worlds" (which had caused mass hysteria), with the episode's title being a direct reference to the novel (with the last part of the episode's title, "coprophages", referring to a dung eater). The town featured in this episode also takes place in—Miller's Grove—is a play on Grover's Mill, the setting of Orson Welles's 1938 radio adaptation. Originally, a scene featuring the sheriff discussing a noted case of hysteria from the 1930s was planned
The Spanish Earth the subject, the apolitical 1937 film, "The Last Train from Madrid". A later film, "Blockade" (1938), was also sympathetic to the Republicans. Orson Welles, who starred in Archibald MacLeish's verse play, "Panic" (1935), and had recently performed the role of narrator in his CBS Radio verse play, "The Fall of the City", recorded the narration for "The Spanish Earth" in May 1937. An additional English-language release is narrated by Ernest Hemingway. A French-language version is narrated by Jean Renoir. President Franklin D. Roosevelt and Eleanor Roosevelt invited Hemingway and Ivens to show the film at the White House in advance