Factual error: The device used near the end of the movie for ferrying people to another building is repeatedly referred to as a "breeches buoy." It is actually a highline transfer chair. A breeches buoy was an earlier, more primitive device that was basically an oversized life preserver with a pair of large canvas trousers (breeches) sewn to it.
Factual error: When the fire department first arrived, they should have had the utility provider shut off the gas lines to avoid just the type of explosions that happened continually throughout the movie.
Answer: Mainly it was about egos (mostly McQueen's) and a professional rivalry, not only as top movie stars, but also as auto racers. McQueen considered himself a superior driver to Newman, even though they never competed against each other. When McQueen was considered to co-star with Newman in "Butch Cassidy and the Sundance Kid," McQueen wanted top billing, then dropped out when he wouldn't receive it, even though Newman was considered the bigger star. In "The Towering Inferno," McQueen supposedly obsessed over how many lines he had compared to Newman.
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Expanding on this: McQueen's demand for top billing continued on this film (as did William Holden's, but he was never a serious candidate), which is why the end result was "staggered": McQueen's name was to the left but lower, while Newman's was higher but to the right, so both had top billing depending how one read it (left-to-right, or top-to-bottom). Studies have shown that the name audiences tend to see first is the one on the left, regardless of staggering, so McQueen may have "won" here.
Newman does get a small victory of sorts at the end of this film when the cast credits begin scrolling upward on the screen. Newman's and McQueen's names are again staggered like in the beginning intro, but Newman's name appears first as it scrolls up from the screen's bottom.
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