- Rob Wagner's documentary film, "Our Wonderful Schools" (1915), won a bronze medal at the 1915 Panama-Pacific International Exposition fair in San Francisco.
- A committed Socialist, Rob Wagner served as an editor of the Los Angeles-based The Western Comrade magazine from 1913-1914 and contributor to many leftist publications. He was also active in Upton Sinclair's campaign for Califormia governor in 1934. During World War I he was called before a federal grand jury on suspicion of sedition for his outspoken support of Socialist and Bolshevik activists.
- While accompanying Charlie Chaplin on a Liberty Bond tour in April 1918, the U.S. Justice Department and War Department kept Wagner under 24-hour surveillance as a suspected German agent because of his alleged pro-German statements and activities as a militant Socialist.
- Cousin of actor Henry Travers (1874-1965).
- Cousin of actor Max Wagner (I), cinematographer Blake Wagner (I), screenwriter Jack Wagner (III) and cameraman Robert H. Wagner.
- The subject of the book "Hollywood Bohemia: The Roots of Progressive Politics in Rob Wagner's Script.".
- In the Season 1 Pilot of the television series "You" (2018), at the 0:38 mark in the bookstore scene, a poster version of Wagner's color illustration on the "Clack Book" magazine cover (September 1897) of two men poised to run a race is clearly visible.
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