Toward the end of the film, when Mary Mapes is talking on the phone to Dan Rather, she is leaning against a bookcase in her home. On the shelf, you can see the autobiography of legendary Washington Post editor Benjamin C. Bradlee, called "A Good Life". Bradlee was editor when the Post exposed the Watergate scandal. As in this movie, he had to manage a media disaster when it was discovered that Post writer Janet Cooke fabricated a story about a young drug addict, which won the 1981 Pulitzer Prize. Once the truth came out, the Post returned the prize.
The film starts off quite colorfully but as Mary Mapes finds herself in a more compromising position, the color gradually drains away. Cate Blanchett is also filmed more in center frame to emphasize the walls closing in on Mapes.
Mary Mapes was initially not interested in having her story made into a movie. It required James Vanderbilt, his wife and a delegation of his producers to go visit her in her home in Texas to persuade her otherwise.
Actors are only allowed to submit one lead performance if they are going for an Academy Award nomination for a leading role. Cate Blanchett opted to have her performance in Carol (2015) submitted for consideration instead of her equally well-received performance as Mary Mapes in this film. It proved to be the wiser choice, given Truth (2015)'s disastrous box-office performance.
The restaurant scene in Truth was shot in a South African chain restaurant called Spur that specialize in Burgers, Meat and mexican dishes, with a Native American theme. The particular restaurant is in Sydney, however.
In the scene toward the end of the movie where Mary Mapes is taking to Dan Rather on the phone, a book titled "Katherine Hepburn" can be seen on the shelf behind her. Cate Blanchett played Hepburn in The Aviator (2004).
The trivia item below may give away important plot points.
CBS, the US television network that fired its investigative journalist Mary Mapes (played by Cate Blanchett) over the scandal depicted in this film, refused to air ads for this movie. Its reasoning was that the movie's take on the real-life scandal does disservice to the truth, to the public and to journalists. On the other hand, Dan Rather (played by Robert Redford), who also had to leave CBS after the scandal, claims that the movie is a very accurate depiction of these true events.