- Had one wooden leg, the left, which was kept a secret to the public for most of his career. He lost his leg in action during World War I.
- According to Cecil B. DeMille, while filming a fight scene in Hawaii with Marshall and another actor, the scene was perfect except for the final blow, which Marshall was supposed to throw. Marshall hesitated, and when asked why, he stated: "Mr. DeMille, I just cannot bring myself to hit a man full in the face." Source: Lux Radio Theater broadcast of "Dark Angel", 6/22/1936.
- He portrayed British intelligence agent Ken Thurston in "The Man Called X" on CBS Radio (1944-1948) and NBC Radio (1950-1952).
- He appeared with Eric Blore in four films: The Good Fairy (1935), Breakfast for Two (1937), The Moon and Sixpence (1942) and Forever and a Day (1943).
- He appeared with Bess Flowers in five films: Blonde Venus (1932), Adventure in Washington (1941), The Razor's Edge (1946), Angel Face (1952) and The Fly (1958).
- He was awarded a Star on the Hollywood Walk of Fame at 6200 Hollywood Boulevard in Hollywood, California on February 8, 1960.
- He appeared in four films nominated for Best Picture Oscar: Foreign Correspondent (1940), The Letter (1940), The Little Foxes (1941) and The Razor's Edge (1946).
- Biography in "Bad Boys: The Actors of Film Noir" by Karen Burroughs Hannsberry.
- Following his sudden death, he was interred at the Chapel of the Pines Crematory in Los Angeles, California. He passed away on January 22, 1966, four months from what would have been his 76th birthday on May 23.
- He was portrayed by Jeff Rector in the FX series' first season episode The Other Woman (2017).
- Father of Sarah Marshall.
- Ex-father-in-law of Mel Bourne.
- Grandfather of Timothy M. Bourne.
- He appeared with Herbert Evans in four films: Riptide (1934), Angel (1937), Foreign Correspondent (1940) and Forever and a Day (1943).
- Brother-in-law of Joan Mallory.
- He appeared with Reginald Owen in four films: The Good Fairy (1935), Forever and a Day (1943), The Secret Garden (1949) and Five Weeks in a Balloon (1962).
- He appeared with Holmes Herbert in four films: Accent on Youth (1935), Foreign Correspondent (1940), The Letter (1940) and Anne of the Indies (1951).
- He appeared with Isobel Elsom in four films: Forever and a Day (1943), The Unseen (1945), Ivy (1947) and The Secret Garden (1949).
- He appeared with Doris Lloyd in four films: The Letter (1940), Forever and a Day (1943), The Black Shield of Falworth (1954) and Girl from Hong Kong (1961).
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