Asked to comment on her remarks, Redford said the film industry's existence brought economic benefits that should receive more recognition.

BBC: Robert Redford: Film industry benefits economy

An assistant to Berg said he was on a film shoot and not immediately available for comment.

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Filmmaker Michael Apted borrows Kaku's quirky comment for the title of his charming, poetic new film on how scientists create.

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Mr. FIELDS: You know, well, not having seen the film, of course, I can't comment on the content.

NPR: Roundtable: Rice, Rumsfeld in Iraq, 'United 93'

Though the abortion debate is one of the most polarising in the US, the film tried to present the doctors' work without the political context, shooting the film in a fly-on-the-wall style without comment.

BBC: After Tiller: America's four late-term abortion doctors

Film historian Dr Matthew Sweet told BBC News Online the history of the zombie film goes back as far as the 1930s, with the undead treated more "poetically" to comment on capitalism.

BBC: Dawn of the Dead (2003)