When Maia and William arrive in afuera and are taking the ware taxi your see the camera is looking over Williams shoulder, your can tell he is wearing sun glasses.but, when it switches and looks over Maria' shoulder William is not wearing the sunglasses any longer.
The numerous seeming "errors in geography" are actually an intentional artistic choice. Because the film is set in a future where global cultures have become thoroughly merged, Michael Winterbottom purposely blended footage shot in Shanghai, Dubai and Rajastahn so that Shanghai has a desert outside it, etc.