Diversity
There weren’t a lot of Korean actors back then so just about everyone from second-generation Chinese-American actresses to Japanese actors played the part of Korean soldiers, officers, captains, and girlfriends.
That’s my hat
In 1970, the film was created! While the TV show wouldn’t actually start for another two years after. You’ll see that Alan Alda is wearing a hat in the opening credits. This hat is the exact same one that Donald Sutherland (who played Hawkeye) wore in the movie, but weirdly enough, it never appeared again in the entire series.