I have. Like how their government lies about the air quality index, but when you check the index as generated by any other country's embassy you get a much higher number. How the people are taught that smog and unhealthy air is normal, and are afraid to talk about it if you bring it up. Or how major world events don't hit the papers, and if they do are given massive spin. Or how huge swaths of the internet are blocked. I used to live on an international floor in college, and when one of the Chinese students came here and went to the library, he said he read Chinese history and cried because it was so much different from what he'd be taught.
