This marks the 3rd mission in a row that features a minor character (though significant) with a connection to M*A*S*H (before M*A*S*H): Loretta Swit in this one, Larry Linville in the previous one (his third appearance) and Robert Alda (Alan Alda's father) in the first of the three.
Like most locales on the series, Norville County is fictional; there is no such county in the United States. However, there is a town named Norville in Livingston County in Missouri.