1 - 'Different' attitudes towards customer service
In the States, the customer is King (or Queen). And that's how it should be of course. If someone wants your business, they should be very nice to you, otherwise you'll take your business elsewhere. For some reason though, in many other countries shopkeepers and customer service representatives don't seem to have the hang of this simple fact, and they either appear to think that they have an inalienable right to our business, or they don't care at all.