One of our best friends last night gave us silver champagne flutes for toasting on the day. (If you want make info, PM me!)
Other than that, I think there are few differences -- on top of the hats!
The 'wedding breakfast' would be akin to a US reception. Ok, I get that.
Then there's a 'reception' afterward...which is basically the dancing/continuation of the US reception. But I think we're supposed to get a buffet for that..?
The weddings here seem to be rather long events, lasting from 1pm till 1am, whereas the US ones I've attended have been more in the 6-8 hour range.
The speeches are another thing, as mentioned by gretel44, and I've seen quite a few non-traditional swappings of roles. That is, in a wedding next month, the 'best man' is a female friend and my DF was 'chief bridesmaid' at his sister's wedding. (No, he didn't wear a dress! hehe)
Other than that, meh. I think they're all beautiful events to celebrate happy occasions!