Flags are quite a complicated issue here. The ones I pictured are just the basics, and there are plenty more. For example, whereas the U.S.A. also uses Old Glory for all ships, the U.K. has separate ensigns for different categories of ships. Then there are the various Royal Standards and complicated rules about which are flown when the queen is resident, and so on.

There are many more differences in terminology, pronuniciation, usage and grammar between the U.S. and the U.K. than many people realize. Sometimes it's not just a different word or meaning, but a word which has much more subtle overtones in one country or the other.

By the way, regional accents and slang/colloquialisms in the U.K. can change drastically within a very short distance. Many of us from the south have trouble understanding a lot of regional dialects, accents, and words from other parts of the country. For those who aren't quite familiar with the scale, the U.K. has an area just a little smaller than the state of Wyoming.