Director Gus Van Sant originally planned to make this movie in the 1990s, with Robin Williams starring as John Callahan.

Rooney Mara and Joaquin Phoenix have worked together in Her (2013), Mary Magdalene (2018) and Don't worry, He won't get far on foot (2018). They started dating during the production of Mary Magdalene in 2016.

Jonah Hill was also named Donnie in The Wolf of Wall Street (2013).

-It is based upon the memoir of the same name by John Callahan.

-The film had its world premiere at the Sundance Film Festival on January 19, 2018.

Joaquin Phoenix and Rooney Mara previously starred together in Spike Jonze's Her (2013).