In the first scene, in which stutterer Yuri Zhary is being hypnotized, a shadow of the boom mic is prominently visible on the wall behind him. However, because this is clearly supposed to be a recreation of a TV broadcast, it appears to be a intentional error.
During the last scene when the grandmother is accompanying the two children through a field, and the camera backtracks itself into dark woods, on the lower right portion of screen, the gleaming camera tracks are visible for a few seconds.