The film generated intense controversy , including disputes over its accuracy . The title of the film alludes to Ray Bradbury 's 1953 novel '' Fahrenheit 451 '' , a dystopian view of the future United States , drawing an analogy between the autoignition temperature of paper and the date of the September 11 attacks ; one of the film 's taglines was " The Temperature at Which Freedom Burns "
September 11 attacks
September 11 attacks
Fahrenheit 9/11