Although it seems to me that the greatest differences lie in the spoken language since serious literary English barely differs between the two sides of the Atlantic, I accept that a certain standardisation of English along American lines is inevitable and indeed I would be all in favour of a simplification of spelling going even further than that initiated (and unfortunately left incomplete) by the Founding Fathers of the USA so many years ago, I must admit to disliking some "interlopers" that appear to be an impoverishment/vulgarisation rather than an enrichment of the language wherever it is spoken in the world.
To me there is for instance a difference between "to convince" and "to persuade" but "convince" seems to be supplanting "persuade" in all contexts. I dislike "regular" where we would say "ordinary" or "normal". "Can I get a beer" sounds very impolite and "I'm good" sounds like you are well-behaved.. I dislike the American tendency to put the stress on the first syllable of placenames such as BAGHdad, HONGkong, SINGapore, COPENhagen, TURin etc. etc. Very few British people have direct contact with Americans so much of the responsibility for the huge influx of Americanisms can only be attributed to Hollywood, not to mention our own media as any keen Eastenders viewer/listener will know. What I want to know is what Americans themselves think about the language?