Unfortunately, you're misunderstanding what Jobs said. They said it drops ~1 call per hundred than the 3GS, not 1 percentage point more. That's a huge difference. It means that if the 3GS drops 1% of calls, the iPhone 4 drops 1.01% of calls.
Jobs said: "One or less additional dropped call per hundred calls". I don't know how I should parse this to be "one percent more dropped calls than 3GS".
"It means that if the 3GS drops 1% of calls, the iPhone 4 drops 1.01% of calls."
"If the 3GS drops 1% of calls", it drops one call per hundred.
That means the iPhone 4 drops two calls per hundred, or 2% of one hundred calls. Not 1.01%.
Just to show I'm somewhat unbiased on the issue -- if we want to question Apple's data why did they show AT&T store returns and not Apple Store returns?