The market for Hollywood movies in China is so lucrative that Hollywood producers will change anything they want in order to get in theaters there. That can mean dropping references to ghosts, international crime, or politics. Oh, always drop the politics.
In some cases, entirely new scenes were shot to make Chinese officials happy, as you'll see in this video from Looper. After all, only a limited number of American movies will be shown each year in China. -via the A.V. Club