My home country is NZ.
The thing that apparently catches many people out when they shift there (not just Brits, although it caught my inlaws out, who are Brits), is the instruction 'ladies, bring a plate'. It means bring a plate of sandwiches, scones, whatever, to contribute. Many, many immigrants ruefully recall how everyone laughed when they brought a plate, as per instructions - with nothing on it.
Also, people who move to NZ are often dismayed at how poor our older housing stock is - poorly insulated, and cold, and damp.
And how expensive everything is.
And how Te Reo Maori is taught in schools, and used in broadcasting, despite very few people being fluent, or knowing any of it much. Quite a few people (not just immigrants) are very hostile and resistant to that. And to Maori and Maori culture and history being celebrated and taught, as being the tangata whenua (people of the land- so them what was there first), and a treaty partner of equal status to the English.
And how parochial we are, with a very big chip on our shoulder, and far too much in the way of cultural cringe.
And just how much the rugby matters.