You have highlighted a lot of the additional complications of flying in Europe compared to the states.
Others are customs and imigration procedures, particularly if you hold a non EC passport.
Cash. Its not cheap to fly in Europe.
Weather is in general more changeable and more localised, but without some of the extremes you get in the states.
Radio terminology is different, some of which you will probably have covered if you do a JAA licence.
Flight rules change from country to country, not just culture and language.
Cash again. Europe has 5 or 6 different currencies, and some airfields require payment for landings and fuel in their cash, not plastic.
I am sure there is a lot more to add.