Although I tend to deliberately wind people up by claiming the reverse, I think the Americanisation of the English language has made the language easier to spell and pronounce. Except maybe for your overuse of 'Z' in words.
However, here are todays slight annoyances: 'It was very fun' and 'It was so fun'. Those are nails down the blackboard to me.
You? Does anyone have any annoying 'English-isms'?