When Huang Ling jumped from the window, the camera was reflected on the other window in front.
In the same scene, when Huang Ling goes down the stairs, you can see a person's hands holding a walkie-talkie on the left.
When Wang Jin packed up his stuffs and walked into the living room from the balcony, the shadow of the camera appeared at the bottom of the screen.
At the beginning of the movie when Wei Bu's father drops his pills and bends over to pick them up you can see the shoes of the camera man visible.
When Webb went taking the spare key behind his grandmother's house, a piece of snow fell on the lens.