One great bit in the execrable Inglorious Basterds was where someone noticed that Germans and British people make the sign for three in different ways. I love these cultural comparisons that show how arbitrary much of what we do is. I looked at information from laces here
This is a video showing how money is counted in different countries.
How People Count Cash? - Click here for more free videos
I have heard Japanese people ring out clothes differently to the rest of the world but can find no evidence of this in spite of asking a few of them. Do you know of any other cultural differences?