my favorite is the backwards plumbing which really does not matter much as there is never much hot water anyway. Doors open wrong, windows backward is very common. If its possible to do it wrong it will be that way from time to time. I still have a hard time getting used to steps of a different height. We added an apartment to my wife's house in Villa on the second floor. The stairs were done in slick tile. How anyone has not gotten killed is beyond me. Its really steep and the steps are slick as snot. In the rain its especially bad. I never go up as I do not want any part of the stairs. Dominicans get used to this stuff and do not seem to even notice it.