When the young Chinese girl is kidnapped, while in the car, her tie is on. When she tries to fight the guy her tie is off in one shot, then back on again a few seconds later.
Towards the end, where Soo Yun is reunited with her father outside of the museum, there is a news van in the background. The call letters on the van start with W, which is typically reserved for television and radio stations in the eastern U.S. with few exceptions. In the western U.S. of course, the calls typically start with a K. There is no "W" station currently broadcasting in Los Angeles.