Some more:

Handbag = Purse
Waistcoat = Vest

And the pizza hut adverts that are currently being shown in the UK are obviously American because the taglne is "We you the pizza, you do the math"

Which raises 2 points:

1) maths = math
2) "you do the math" is a real americanism
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Mk2a RioCar 120Gb - now sold to the owner of my old car
Rio Karma - now on ebay...