If you listen carefully to his interview, from 1:30 for about 2 minutes, the foreman talks about the jury discussing the 460 patent and how it brought him back to his 'Aha' moment.
"The software on the Apple side could not be placed into the processor on the prior art and vice versa. That means they are not interchangeable. That changed everything right there."
http://www.youtube.com/watch?v=c9cnQcTC2JY
That's the reason why prior art was ignored!