Although Ann-Margret originally signed for the role of Ida Silver in late December 2016, she was recently forced to exit the series due to an illness in her family. Holland Taylor has been tapped to replace her as Ida Silver. The role reunites Taylor with David E. Kelley, who also worked together on Ally McBeal and The Practice, the latter for which she won an Emmy in 1999.
Brendan Gleeson previously appeared in Harry Potter and the Goblet of Fire. Stephen King is an avid fan of the Harry Potter series. That film featured a climax that took place in a hedge maze, similar to the film version of The Shining (which King hated).