Popsugar Entertainment A Simple Favor A Simple Favour Movie Cast A Simple Favour: The Cast For the Upcoming Adaptation Is Flawless 9 August 2018 by Corinne Sullivan View On One Page Photo 8 of 9 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 8 Sarah Baker Sarah Baker, who played Thea Cunningham in Big Little Lies, will take on the role of Maryanne Chelkowsky. Previous Next Start Slideshow A Simple FavorMovie CastingMovies