If you have it, watch this program in HD. It takes some doing to find the HD channel number for your zipcode, at least on Comcast; for me, it was one channel lower than the regular one.
The episode was directed by Michael Cuesta, who is also a producer. Cuesta directed "L.I.E." ("Long Island Expressway") in 2001. That film had a showing at the Lagoon Theater (Landmark) in Minneapolis on September 11, 2001, and Cuesta was there for a Question and Answer. I met him personally in a bar in downtown Minneapolis afterward; he was stranded there because of the airlines shutdown after 9/11. (I lived in Minneapolis myself at the time.) I recall that the DVD of "L.I.E." was edited to remove the old World Trade Center towers. Since he directs this series with its subject matter, I'm sure he remembers that day and that film showing well.
The show does not seem to have any commercial breaks, which means that the viewer gets a full hour of rather densely-plotted television viewing.