Glimpses in a British to American Dictionary

(source: iSLCOLLECTIVE)
no copyright infringement intended

A few more:

baggage reclaim - baggage claim

haitch - aitch

letter box - mail box

lovely - okay

maths - math

mobile - cell

petrol station - gas station

toilet - restroom

well done - good job

well, hellooo there - hello

whoops - oops

And for even more, look in Roger Cohen's op-ed:

http://www.nytimes.com/2014/12/02/opinion/roger-cohen-the-long-road-from-american-to-english.html

Here's a comment made by Lee Harrison : English started out a pidgin … a language so much simpler than Saxon, a result of the Norman conquest (the Normans speaking a recently adopted and transformed language). Amusement by Americans at English-English usage and slang pales at the onslaught of the continuing pidginization … the adverb is disappearing. Oscar Wilde's elegant putdown of my ancestors has no modern currency: "They came to do good and ended up doing very well." Languages are owned by the masses who speak them -- Portuguese has been ceded to the Brazilians -- English will be ceded to Indlish and Chinlish -- get used to it.

(A Life in Books)