Yeah, I noticed that resemblance, too. I actually re-wound and paused on their side-by-side shot because my sister missed it. Uncannily alike.
Yeah, I'm thinking Kingman never really understood (cared?) what Adam did. He seemed really removed and abstracted, and you'd think he'd be used to being on camera. He was more awkward than the "ordinary" families. At the end, though, I think I saw a little tear in his eye, so hopefully he really is proud of him. It was weird to see how small Adam is next to his dad.