Such as?
The live/test switch is a good example. It confuses everyone: you're just switching between the data that's shown, but everyone thinks you're switching the underlying state of your account. It's something we've had on our list to fix for a long time.
I'm so glad to know that, I was thoroughly confused :D
U.S. availability only?
Zing, however Stripe is in 4 countries now.
I actually find it more interesting that quite a few of the obviously copied bits aren't even really worthy of copying if you're already going through the effort of building an entirely new product -- they're pieces of our product that could stand to be improved. :)