Trivia

Guest-starred in 5 episodes on M*A*S*H (1972) as different characters from 1975 to 1982. Two of those episodes were in 1975 alone.

In 1995, Oh founded the Lodestone Theatre Ensemble in response to the 1992 Los Angeles riots that dangerously reignited racial stereotyping. His continued efforts to present more accurate portrayals of Asian-American culture on stage has been significant.

He played four roles in the Broadway musical "Pacific Overtures." One of his roles was as Tamate, a woman, played in Kabuki style. He also staged the show's martial arts sequences.

His friendly countenance and gentle demeanor made him one of the busiest Asian-American actors over a forty year period from the mid-1960s to the mid-2000s, especially in friendly and sympathetic roles.

Was sometimes mistakenly believed to have been Japanese, due to being born in Japanese-occupied Korea and often playing Japanese characters.

Like other popular Asian actors before and after, although he was Korean, he was often cast as Japanese, Chinese, Vietnamese and even Indonesian.

He and fellow Death Wish 4: The Crackdown (1987) co-star Charles Bronson both died of the same cause: Namely Alzheimer's.

He & Stuart Margolin each appeared in several episodes of M*A*S*H (1972) (though not the same episodes together) and also different movies in the Death Wish franchise. Stuart in Death Wish (1974) & Soon in Death Wish 4: The Crackdown (1987).