Well, there's his first problem. He doesn't know the difference between a biased political satire (which I have no problem with) and a documentary.
Better put an asterisks next to that record (at least in the early days). The studio/Moore had to parenthetically state that they were EXCLUDING concert films and IMAX films from this p!ssing contest. They also were not taking into account inflation (it takes fewer $10 tickets to hit $100million than it does $3 tickets).
I wasn't able to view much of the older box office takes on BoxOfficeMojo.com in the brief time I had access (I think you get a week without subscribing).
Woodstock and other films may still be the top draw. I don't know. Certainly at one time in the release of Moore's film it and other films DID trump his film.
I would not be surprised to hear that there are 911 distortions and exaggerations in the film and its promotion.
For example, that does not look like Michael Moore's body shaking hands with President Bush (too thin), let alone they never "shook hands" despite the photographic "evidence". Such usage of even a public figure in advertising requires a signed release or else the studio faces prosecution. Luckily for Mr. Moore, President Bush is a nice guy.
Everyone is "certain" that there was a very lengthy applause after Michael Moore's film in France at Cannes. NO ONE can agree just how long it was (8 minutes, 12 minutes, 20 minutes, 25 minutes?). Facts are funny things when Michael Moore is concerned.