For two countries which share the same language, England and America can sometimes seem like a world apart (well, they are an ocean apart, I guess). I noticed this most acutely on my recent trip to New York with two friends from London. Whilst in London, shop assistants acknowledge you briefly if you're lucky, or watch you through narrowed eyes suspecting you of shoplifting if you're not so lucky.
In New York, it was a completely different story. Everywhere we went, we were greeted by friendly staff asking us about our trip, and recommending things for us to do. The friendliness extends to people on the streets -- someone found me the name of a restaurant in Williamsburg and then actually called up for me, and a couple stopped to Google the nearest subway station for us when we got slightly lost. Of course, not everyone is unfriendly in London, but New York seems so much warmer in terms of customer service.
This being said, the tipping culture stateside seems crazy to me -- in London I wouldn't hesitate to leave a cafe or restaurant without tipping if the waiter had been especially rude. In New York, one waiter went out of his way to follow us as we left the cafe, muttering "You're unbelievable" under his breath. It's not like we hadn't left any tip at all -- it wasn't 18 percent, but we'd only had a small snack and he had been unfriendly and brusque throughout.
The most fascinating difference between England and America for me as a British visitor lies with the language (ironic, given we're meant to be speaking the same one). From foods ("Aubergine? Wait, that's eggplant right?") to clothes ("Trousers? Do you mean pants?"), there are different words, different pronunciations and different expressions. We say "lift," you say "elevator," we say "get in line," you say "get online." The weirdest of these for me is "restroom" -- why restroom? You don't exactly go there to rest... "toilet" seems like a much more logical word.
New York and London are two of the world's most visited cities, and it's not difficult to see why. The fact off the matter is, both England and America are great countries, and it is their individualities which make both so intriguing to visit/live in.