I once had a chat with an American woman who had been in a London restaurant when she asked the waiter Have you seen Lou?, Lou being her husband, she was very puzzled to be directed to the Ladies, took a while to sort it out, much to everyone's amusement.
Our daughter, about 7 at the time, followed OH into a shop and called from the door Ask if they sell rubbers, you wore mine out last night!
Vive la difference, it can be great fun. A couple of friends, Briton and American, told us that half way across the Atlantic football became soccer and pants became trousers.