Light switches installed upside down…alongside light switches installed right side up…alongside light switches apparently not connected to anything…light switches installed on the opposite side of the room from the door…I've encountered all these things over the years in different parts of the world.
One of my biggest pet peeves living in Ireland was that they didn't install valves to shut off the water supply at each sink or even in each bathroom. To fix a plumbing problem, you had to shut off the water to the entire house.
Also in Ireland (and elsewhere), light switches are on the outside of the bathroom door, and you can't have an electrical outlet in the bathroom. I understand that water and electricity don't mix, but how are you supposed to use a blow dryer or an electric shaver (as I do)? Don't tell anyone, but we installed an electrical outlet in the master bathroom of our house in Ireland and put a mirror over it when the time came to sell the place.
The other idiosyncrasy of Irish bathrooms was that, most of the time, they installed separate taps for hot and cold water. If you didn't want to burn yourself, you had to fill the sink with water to mix the hot and cold. I devised my own strategy. I'd put my hands under the hot as long as I could stand it then put them under the cold for a few seconds to cool them off. I'd repeat as needed to get the soap off.
You can chalk up some of these kinds of construction-variances to cultural differences. The Irish seem to be worried about electrocuting themselves in the bathroom, but they're not so concerned about scalding themselves with hot water when washing their hands. Other construction idiosyncrasies, like the backwards lock in Laos, come from lack of experience. It's likely that the guy who installed the slider had never seen this type of lock before.
A friend here in Panama bought some granite countertops to install in the kitchen of the house he was building in Veraguas a few years ago. The crew came to install the counters on a morning when he had to run to town (an hour-and-a-half drive away) to pick up more supplies. When he returned several hours later, his crew was happy and proud to show him that they'd installed the kitchen counters. The job was finished.
Except when he took a look he saw that they'd installed the granite pieces leaving a half-inch seam of concrete in between. It didn't occur to them that the two ends of the two granite pieces they were installing side-by-side should be placed as close together as possible to make the counter look like it was all one piece.
In Mumbai I once watched workers hanging from 30 stories of bamboo scaffolding without safety ropes.
Differences in regulation…lack of training or experience…different priorities…these are all things you have to get used to as you move around the world. Keep your sense of humor. It's all part of global diversification.