I have plenty I'm sure of it, but a couple that come to mind are from Poland since I just played that. In a little fenced off area there's a quite sharp right 3 with a small tree on the exit. I always forget how sharp it is and that tree is as solid as they come. I must hit it about 90% of the time.

Another Polish one is at the very end of one of the stages which makes it that much worse. It starts as a fast right 5, but quickly turns into a much slower left 4, with plenty of trees to smash into on the outside, and if you cut to much, there's a hill on the inside, and you'll 100% roll into the trees and likely have to reset about 10 metres from the finish.

I'm sure there are many others in other stages, but I want to here what else the community is struggling with.