Yes, two men survived who were inside the building and effectively "rode" the debris as it collapsed, cocooning them in relative safety. Their names are John McLoughlin and Will Jimeno and they are the focus of Stone's World Trade Center. I don't know how people here got it in their heads that the film was some all encompassing portrayal of the whole day, but I assure you it's not. I don't think this film will be riddled with bunk conspiracy like JFK, because these men are alive and contributed to the making of the film.
It's probably because Oliver Stone is most remembered for making films that have crackpot conspiracy theories and/or a left-wing political slant. That being said, I will reserve judgement for now on his yet to be released WTC movie.
Getting back on topic of this thread - I have read all the great posts here and plan on seeing United 93 saturday or sunday.
Weren't there also about 10 people who survived on a stairwell area? Some firefighters and a big heavy set woman named Josephine.