<Li> Mary Kraft as Chris' mother </Li> <Li> Gary Basaraba as Don </Li> <P> On November 12, 2014, Variety reported that Anna Kendrick was in early talks to co-star in the film, alongside Affleck . Later that day, J.K. Simmons was also announced as being in talks to join the cast . On November 14, 2014, Jon Bernthal was also in talks . On January 6, 2015, Variety reported that Cynthia Addai - Robinson was added to the cast . On January 14, 2015, Jeffrey Tambor and John Lithgow were added to the cast of the film . Lithgow had previously appeared in another thriller about autism, Silent Fall (1994). </P> <P> Principal photography began on January 19, 2015 in Atlanta, Georgia . On March 16--20, filming was taking place at the Georgia Institute of Technology . Filming wrapped on April 2, 2015 . </P>

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