We are getting married in two weeks time, and have found a few things to be different (a lot, really). We, too, are doing the full-on Nuptial Mass, so we can't do too much durring the ceromony--but a Catholic wedding is a Catholic wedding--regardless of culture.
Most recently, we found out that the order of speeches / toasts are very different in the States than in the UK. It threw Paul for a loop, and we've decided to do it in Brit-order. We are doing the fruit-cake, and will have special boxes to send to invitees who were unable to attend (it's an English thing I'd never heard of before).
I will be getting ready at the Church, which is odd to Paul. I guess that most UK brides get ready at home and ride to the church in full gown et al.
Also, the Brits like to have a late all-night drink after the dinner reception. Something that we are not doing, as we are having an 11 am Mass. In lieu of that, one of my sisters will host an after-party at her home.
The guys will all wear traditional Morning Suits, too.
Good luck, and have a great wedding next spring.