The US flag just barley slips in the 2010 seminal movie about dreams. As the hero enters customs at Los Angeles International Airport, the bottom half of the US flag can be seen - the bottom four stripes.
Dominick, played by Leonardo DiCaprio, gets clearance from a multinational corporate conglomerate to reenter the United States after inserting an idea into anther persons dream, which is termed 'inception' in this film.
The architect of the key inception dream world is Ariadne played by Ellen Paige. When Ariadne passes through customs the badge of the combined US Customs Homeland Security badge can be seen.