- He and wife Louise became "adopted" parental figures to young actor Jimmy Lydon. He was 'best man' at Lydon's 1952 wedding and godfather to his oldest daughter. After his death, Lydon became Louise's guardian for 18 years until her death at the age of 97.
- Dropped out of law school at the University of Washington only months before graduation to follow a vaudeville troupe.
- Enlisted in the Army during WWI and was a private in the infantry.
- He died only one day before Merian C. Cooper, with whom he worked on The Most Dangerous Game (1932), King Kong (1933), Blind Adventure (1933), Son of Kong (1933), The Fugitive (1947) and Mighty Joe Young (1949): Armstrong died on April 20, 1973 and Cooper died on April 21, 1973.
- He was the nephew of the playwright and producer Paul Armstrong , best known for "Alias Jimmy Valentine", "The Deep Purple" and "The Greyhound". His uncle once hired Robert to direct, stage manage and appear in a vaudeville sketch entitled "Woman Proposes".
- His father owned boats on Lake Michigan, then moved the family west (Seattle) so that he could go prospecting in Alaska.
- Extensively discussed by his friend, actor Jimmy Lydon, in the book, "A Sci-Fi Swarm and Horror Horde" (McFarland & Co., 2010), by Tom Weaver.
- Married his uncle Rolf's ex-wife Claire shortly after their divorce in 1939.
- Uncle Rolf (John Scott) Armstrong was known as "The Father of Pin Up Glamour Art".
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