This is in England. A man in the shop is buying a coat and also sees a briefcase. He opens his wallet full of American money and asks the price of the briefcase. The tag reads $30, but he is told that it is on sale for $10.
One chap says he's been enjoying cookies, then invites the other chap to "Have a cookie." In the UK these are called biscuits.
These two chaps keep addressing each other as "Buddy," a somewhat rare expression in the UK. More common would be "Mate," or, in higher circles, "Old Boy" or "Dear Fellow."
Hayley tells Claude to meet her at 7pm but the sign on her shop shows it is open 8-8 on weekdays so she is closing the store earlier than she should. Their date is on a weekday because Claude was working and they have 2 dates the next 2 days where he dresses up as Santa on a Sunday.
In Act III there is a gala at Lloyd house. Guests come in their cars in the front of house. Ben and Beatrice just go out from their VW Beetle, and they don't shut down engine with light on, and even wipers are still working. The same is happening with the car in the front and behind them - guests just get out and leave cars running with lights on and wipers. And yet, there are no valets who would drive them.
While this movie takes place in England, the cars used are left-hand drive, the UK are right -hand drive.