Finding instances of "World War II" and changing them to "the Second World War".
It is startling to think that, even in the darkest depths of World War II, J. R. R. Tolkien was writing the trilogy, which contains, with the applicability available only to poetry and myth, the essential notion that the good grey wizard can understand the evil magic precisely because he is just enough like them to grasp their minds and motives in ways that they cannot grasp. World War II was in fact over many years ago, though with todays news, you'd think World War II is happening today.