Someone rhetorically mentions Atticus Finch, a reference to To Kill a Mockingbird (1962), which was Robert Duvall's screen debut, playing Arthur "Boo" Radley.
Joseph Palmer says in the film that he is seventy-two years old. Robert Duvall was eleven years older when the film was released, and became the oldest Oscar nominee ever for his performance at the age of eighty-four.
First feature release from "Team Downey", Robert Downey, Jr. and wife Susan Downey's production company.
The screenplay for this film was featured in the 2012 Blacklist; a list of the "most liked" unmade scripts of the year.
Despite having worked together in films at least twice before, Robert Duvall didn't remember meeting Robert Downey, Jr. when they got together for this film. He said on Robert Duvall/Robert Downey Jr./Stephen Fry/U2 (2014): "Well, he's cleaned up a lot since!" Duvall and Downey appeared in The Gingerbread Man (1998) and Lucky You (2007).