This is millions of years too late but we stand on the right on escalators to allow people to pass on the left. So it is the same as the roads.
I have lived in southern Africa and China. I was primary age in Africa so don't remember much of what I thought was strange, aside from starting school at 7 and being finished at lunch, and video shops not caring about age restrictions (I got most of the way through 'The Invisible Kid' before my mum realised it was a 15).
In China ten years ago you used to have to do a ridiculous dance in department stores - queue to take an invoice from the department you want to buy from, then queue at a til, then go back to the original department and queue again.
I also lived in one city in the south that had siesta time in the summer and tried to go shopping at lunchtime.
Not putting anything beside human waste in the loo, and public loos having signs saying 'no shitting' 😂.
Nightlife until you want to go home, even if it means staff waiting when their shift is over (mortified when I realised).
Stereotyping foreigners (Koreans are pretty, Americans are violent, British people have great schools and love football and are only white).
Being laughed at in shops because I'm too fat / my feet are too big for what they sell. Being told I can't try that t-shirt on because I'll stretch it but I should buy it because it will fit 😂.
My female Chinese friends following me into the toilet cubicle and remarking on my use of tampons .
Dividing fences in the middle of the road to keep people on the correct side.
People avoiding telling you know when you make a request they cannot fulfill.
Back in England - people coming in your house with shoes on. People putting their coats / bags on the floor. People saying "all right?" and not expecting an answer. No taobao. Even shitty food out costing a bomb.