As an expat (Canadian in the UK), I'm very aware of what I've changed. I now say "mum". I like queueing. I use lots of British constructions. My accent has even drifted a bit (although only DH can tell. Other people say my accent is still quite strong).
But - I will not drink tea. I will not listen to the Archers. I think that doing either of these would mean I have "gone native", and it would be time to go home.
Do any other expats (to anywhere, from anywhere) have similar lists?