I love the funny answers, and thought of a few myself, but to give the subject a serious answer, I think there are quite a few, even if they were trying hard simply to adapt the best ideas from Scotland.
Leave it to America to have developed the irrigation, turf and drainage technology to put courses in many different spots. This is no small task, and merely advancing/adapting/perfecting(?) the art in this way would be a signifigant contribution.
As to individual hole concepts, how about:
The heroic or Cape hole (at least with water) was an American invention of CBM.
The oblique or angled fw? Yes, they existed in Scotland, but I am not sure they were actually designed as such, whereas the Golden Age guys at least perfected the idea.
Scientific Bunkering, i.e. putting them at average tee shot distances from the tee.....
How about RTJ, with Signature Holes, Expansion of Multiple Tee Concepts and Large rolling greens?
Actually, even looking back at all of these, they probably fit in the refinement mode as much as new ideas. But the fact that American courses look so much different from Scottish ones must mean they are somewhat original, no?
While it does seem they are adaptations of ideas, we can't forget that Scottish gca evolved as well, from the quirkiness of Prestwick and TOC in the 1700's to a very refined Muirfield in 1892, which I think influenced golf design when it started in America about the same time.