Robert Altman really wanted to make the film Thieves Like Us, but United Artists wasn't interested. The studio had just bought a company that published country and western songs, and wanted Altman to make a country and western movie. Altman made a deal with the studio which would allowed him to make Thieves Like Us and he in return had to make what would later turn out to be Nashville.
Robert Altman rewrote Doran William Connon's entire screenplay for the film M*A*S*H. This infuriated the writer so much that he wrote an article bashing Altman in the LA Times. Connon later went on to win an Oscar for the rewritten screenplay and never apologized to Altman.
Robert Altman: A good movie is taking the narrative and the story out of it. The audience will sit and see the film and understand the movies intention without being able to articulate it.
Robert Altman: The majority of writers will not understand that they are part of a collaboration in films. The word 'writer' means you write and then you are one on one with your audience. Well, in films you're not one on one with your audience.
Robert Altman: (referring the film "Images") Anything in the film comes from myself, and I don't know where it comes from. I trust instinct more than any study or logical conclusions.