“I know it will be eight episodes and take around four or five months to shoot," he said, "I know very little about it, but we’re shooting in the environs of Los Angeles which is great. It means I get to stay at home and see the kids.”
Apparently, the rest of the cast is still being locked down / subject to the rumor mill. Elisabeth Moss, Rachel McAdams and Jessica Biel are among the many names that have been tossed around. HuffPost Entertainment contacted a representative for HBO to confirm Farrell's involvement. This post will be updated if and when they respond.
In the meantime, what we can confirm is that Mary-Kate and Ashley Olsen will not be involved. Probably.
— Tom Ganjamie (@tomgam) February 20, 2014