The Werewolf - S1-E5
Factual error: The story is set during one of Chicago's worst winters, complete with snow and ice, but the footage of the 747 Carl Kolchak is flying on shows the plane taking off from an airfield without snow or ice to be seen.
Horror in the Heights - S1-E11
Factual error: Outside the Indian restaurant, the street curb is painted red. In Chicago, throughout the 1970s, curbs were painted white or yellow to indicate special parking zones; never red.
Factual error: Kolchak's narration has the episode's events begin in February in Chicago, but there is no snow, nor indication of cold weather.