I've long been told that the studio was shooting for a runtime of less than 2 hours and they made it by 7 seconds.
What this means is that the film itself is about 1 hr and 45 to 50 mintues, give or take. When you add in the initial end credits, then "something," and then the remaining end credits, you get the whole 1:59:53 runtime.
Wow. This means that A LOT was cut -- probably a half hour at least -- from what was filmed during principle photography. When you add it the stuff that was re-shot/new under Joss Whedon, I think it's fair to say the final product is probably more than a tad different what was originally planned.
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