The entire cast returns to the English countryside in “Downton Abbey: A New Era,” and CinemaBlend’s Mike Reyes got the privilege of discussing all of the behind-the-scenes details with stars Allen Leech, Laura Carmichael, Joanne Froggatt and Phyllis Logan, as well as Creator Julian Fellowes. Watch as they dive into filming a movie within a movie, the excursion to the South of France, and what they’d like to see in “Downton Abbey 3,” should it happen.