While going through Ms. Tibbs's apartment, Kolchak reads a "scroll" and describes it as saying she was "some kind of a member of a society at the Max Match corporation...", as if this is completely new to him. Just a short time before, he found the same scroll in William Cubby's apartment.
As seen in from the overhead shot of lakeside Chicago during the opening scene, the cars on the highway are seen driving in the opposite direction that they should be for the lane that they are in.
Helen sacrifices the victim with the glass eye to Hecate, earning Hecate's wrath because he's an imperfect sacrifice. However, Hecate doesn't punish Helen until Kolchak enters Helen's temple and declares the sacrifice imperfect... at least 24 hours after the sacrifice was made.