Frank Langella and Michael Sheen repeated the roles they created on stage. Ron Howard would only agree to direct if the studio would allow both actors to appear in the film version.
Kevin Bacon said that the day Ron Howard called him about being cast in Frost/Nixon, Bacon had tickets to a production of the play for that very same night.
Even while off-camera, all of the actors would remain in character and continue the Frost/Nixon rivalry by bickering and making fun of each other.
Frank Langella admits that he usually enjoys playing cards, and joking around on movie sets, but felt it would compromise his character if he didn't remain Presidential on this set. While working on this movie, other cast and crew referred to him as "Mr. President." Langella suggests almost none of the crew ever met Frank Langella.
Max Elliott Slade: Man standing by the camera at around one hour and five minutes. First appearance in a film in over twelve years, though uncredited as the 'Smith crew'.