I recall Neil deGrasse Tyson mentioning that the whole earth would be smoother than the smoothest billiards ball if scaled down. I found that surprising.
If my calculations are right, Earth's diameter is about 12000km and its highest/lowest places are about 10km, so about 0.001
If a billiard ball is about 10cm, it's highest/lowest places equivalent to earth would be 0.1mm.
Not sure what are the standards for billiard smoothness, but that seems very smooth to me.
A billiard ball is about 50mm in diameter. I guess the question is to what tolerance they are made. I wouldn’t expect a small feature to stick up (you’d be able to feel or see those fairly easily) but the overall deviation from a perfect sphere could easily be that large.
From what I understood from the video, the surface irregularities a general pancake can have when stretched to dimensions of the earth would lead to 10km high feature; Given even Mt. Everest is <9km, I am not sure why Switzerland wouldn't fit the definition
If you stretch the pancake only to the dimensions of Switzerland, the vertical features would be a lot less high. And Switzerland has quite some height differences within a small area.