F9/11 uses facts in evidence and it quite obviously passes the legal standards. Miramax and Moore wouldn't have released it if it didn't meet the legal standards (and, incidentally, both have indicated that legal firms were consulted and are retained in the event a libel/slander suit is launched); too much money at stake for them to make that type of move without legal consultation.
F9/11, however, is a distortion of the facts, a misrepresentation. There are many ways to accomplish this. You can put two disparate facts together and present them as having a causal connection of some kind. You can read into the absence of information. You can proof-text an issue while ignoring contrary evidence. In the case of film, you can take cut, edit, or juxtapose images to communicate certain implicit ideas. I could go on... the art of propaganda is extensive.
