xD Said flower-girl wrangler would be classed as a bridesmaid, over here. :P Because yeah, normally flower-girls are singular or a duo, and then they walk in front of the bride -- scattering petals or whatever for her to walk across. Bridesmaids/maid of honour tends to the bride's clothes -- that being the 'maid' part -- and usually, when said bride has a train/veil, the maids ensure it's not going to get walked on, that it's arranged nicely, etc. I don't know where the tradition comes from, but.

I don't think there's anything else especially 'English' as such -- having never been to an American wedding, I don't know what ought stand out! Not a lot of the original traditions cling on wherever you are, unfortunately. Some people used to choose their wedding flowers by what the flowers actually 'meant' for example.