 GEOG: When Xander is captured by the Americans (after skateboarding  down the railings on a dessert tray) he is taken into a concert  hall. The exterior shot is of the Rudolfinum Concert Hall in Prague,  however the interior shot is of a completely different building, the  Prague National Theater (notable for its red velvet seating). In  addition, on the director commentary, the director explains how that  theater (the National Theater) is where Mozart premiered "Don  Giovanni." This is also incorrect as that opera premiered at the  Estates Theater, another theater in Prague but not pictured in xXx.