‘Olive Ketteridge’ HBO Cast Update: John Gallagher Jr, Jesse Plemons and Zoe Kazan Join Miniseries John Gallagher Jr., Jesse Plemons, and Zoe Kazan are the newest additions to the cast of the upcoming HBO mini-series Olive Ketteridge, which stars McDormand and Richard Jenkins, and is being executive produced by Tom Hanks and McDormand.