Billy and Isabel Hazard are played by two different cast members in this mini-series.
When George is to meet with Lincoln, the exterior shot identifies the location as the War Department. However, the interior rooms where they meet are definitely Lincoln's cabinet room in the White House, as well as the White House East Hall, in those days a reception area, and a private southeast corner room, today known as the Lincoln Sitting Room.
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We asked Doctors Jo Wilson, April Kepner, and Andrew DeLuca to tell us the episodes of the show that they think are the most essential to understanding their characters.