Nevermodern...I am entirely in agreement on the use of 'can I get?' by English folk. Horrid, misleading and so very common.
The tendency for English people to mispronounce schedule as sked-ule rather than shed-ule is another one.
Two food related creeping Americanisms are 'sprinkles' (ahem, I think you mean 'hundreds and thousands') and 'frosting' which I saw used on an M & S Christmas cake box this year. No, no, no - it's icing!
Sainsbury's use of the term 'colleague' when they clearly mean 'staff' [as in 'Colleague access only'] might not be American-English but it certainly makes me wince too.
I know languages aren't set in stone but I'd prefer not to surrounded by people talking like they're imitating Pheobe in Friends...Yay!