Is a sixth season a done deal? I don't know how much more story there is to tell now that they've finally made it. If this was it for the series I'd be ok with it. It was satisfying to see them finally succeed. I'll admit, I was convinced that the usual setback was about to happen right up until the end when Gilfoyle sent out the patch. I was expecting the patch to fail or some horrible unintendended consequence to occur.
It wasn't really a line, but Big Head stepping all over the big dramatic discovery scene by refilling his Big Gulp was hilarious and to me was probably the funniest moment of the episode.