UK English Grammar vs. US English Grammar

[Shaka_Khan]

Reading various forums and TW multiplayer foyers made me realize how different UK grammar is from US grammar. The ones we are pretty much aware of is the spelling and what we call certain things. Examples would be 'honour' vs. 'honor' and 'valour' vs. 'valor', or how we call things such as 'football' vs. 'soccer' and 'lift' vs. 'elevator'.

I noticed more differences from novels. The British use single quotes (') while the Americans use double quotes (") when quoting a character. Examples:
'I went there,' she said.
"I went there," she said.
What confuses me is that old British novels used double quotes.-> http://www.amazon.com/exec/obidos/IS...gamesA/#reader Maybe it's because the book in that link is an American version. I'll check Tolkien's books.

I wonder. Do the British and the Americans get annoyed when they see grammar different from their's? Also, what are the other differences in English grammar? And what about Canada, Australia, New Zealand and South Africa? I started to be aware (and worry) of how I write in English when I started to chat with the world.