The Jones house is located at 1060 W. Addison, which in real life is the address of Wrigley Field (this joke was made famous by The Blues Brothers (1980)).
Claudia Black miscalled Harry Dresden "Harvey" as an in-joke for a "clueless detective". "Harvey" was the often helpful "Scorpius" alter ego of the "Farscape" series, also starring Claudia Black and also produced by the Sci-Fi channel
Early in the first Dresden novel it is indicated that Harry has an Investigator's Licence. In the episode Storm Front (2007) (cut down from original pilot) Harry carries a Chicago Police Consultant's I.D. card.