* Stevenson telling Dave he would have taken a bullet for him. You really sense that he would have done so not just because it's his job, but because he genuinely liked and admired him.
* Earlier, when Stevenson starts opening up to Dave after being a cold security officer up till then. And it's through a mere discussion of outfitting. "You think I'd look good in a sweater vest?"
* Dave and the first lady falling in love.