The Klansman

The Klansman is a 1974 American motion picture drama based on the book of the same name by William Bradford Huie. It was directed by Terence Young and starred Lee Marvin, Richard Burton, O.J. Simpson, Lola Falana and Linda Evans.

Richard Burton allegedly drank so much alcohol during the making of this film that many of his scenes had to be shot with him seated or lying down, due to his inability to stand. In some scenes, he appears to slur his words or speak incoherently.

Source: Wikipedia