By subtle differences, I don't mean the use of a letter z instead of a letter s, such as in 'optimization', I'm referring more to things like trailing commas before the 'and' in a list. For example, the correct UK English would be:
I like going to the park, eating ice-cream and playing on the swings.
Whereas the correct US English would be:
I like going to the park, eating ice-cream, and playing on the swings.
I just wondered if UK writers and US writers have this problem when writing copy for clients based on the other side of the pond?