Nothing behavioural has really been too shocking to be honest wherever I've been. I've heard people in X part of the world do X, I see people doing X, I accept it. I heard people piss and spit in the streets in China before I came here, they do, I see it, it's always been whatever to me. I've always been pretty unquestioning/unmoved about behavioural differences.
What I notice is more stuff like I can go to a bank here and get everything sorted on that day. From the amount of paperwork I see happening in the background it looks like they cut down an entire tree just for me, but everything can get done then and there...as opposed to the UK when, no matter what it is, you need to wait a stupid amount of working days for any little thing concerning a bank. Same with hospitals. I can go in for tests without an appointment, say what I want, get the tests done then and there, and have the results within the hour. The fact that it's possible not to have to wait working days for these kinds of things really surprised me.
Also transport costs anywhere in the world is always so much cheaper than the UK so I'm never left thinking 'this is going to cost me an arm and a leg just to get there'.