- Duggan's wife, Elizabeth Logue (aka Betty Duggan), died from cancer in Santa Monica, California, on June 7, 1988, less than a month after his death from the same disease. She was a dancer and actress from New York, born on August 10, 1932. They had three children together: Richard, Nancy, and Melissa.
- After having a cancerous lump removed from his vocal chords Duggan acquired a raspy voice which enabled him to have a lucrative career doing both voice-overs and TV commercials.
- Often played men older than he was. He was only 13 and 14 years older, respectively, than James Stacy and Wayne Maunder, who played his sons in Lancer (1968).
- He was the voice of Father/Narrator in the second generation 1975 Carousel of Progress, the first version to premiere in Walt Disney World. Rex Allen was the original Father for the 64/65 World's Fair Carousel of Progress which was later moved to Disneyland in 1967.
- At least 32 characters played by Duggan were in the professions (judges, doctors, LEOs, and religious figures), more than 28 were military officers (generals, colonels, captains, majors, etc.), and 5 or more characters were historical United States presidents, including Dwight D. Eisenhower (portrayed three times) and Lyndon B. Johnson (portrayed once).
- Graduate of Indiana University (Bloomington)
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