Irishman Aidan Gillen is the latest non-American to become part of the cast, joining Englishmen Dominic West and Idris Elba.
Robert Wisdom, Seth Gilliam, Domenick Lombardozzi, Jim True-Frost, Corey Parker Robinson, J.D. Williams and Michael Kenneth Williams all graduate to the opening credits.
Each season has a different version of the song "Way Down in the Hole". For Season 3, the interpretation was from The Neville Brothers.
The opening demolition of some of the buildings in the housing projects was all done with CGI. The buildings still stand.