Continuity mistake: An influenza epidemic is exacerbated by a very cold windstorm. The wind is obviously created by a wind machine. In all the outdoor scenes, dust and leaves are blowing in the foreground but the trees and bushes in the background are motionless.
Continuity mistake: During the final minute of this episode, the sound of a roaring wind can be heard. Two close-ups of a statue and a close-up of a boy in the street show swirling dust and leaves. In the long shots, there is no evidence of wind. No dust is blowing and all the trees are completely still.