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Liam Hennessey's real name is Chris Collier.
There is an Alderman Sanchez on the Chicago City Council. In reality, at the time this episode first aired, there was no such alderman on the Chicago City Council.
There is an Alderman Blevins on the Chicago City Council. In reality, at the time this episode first aired, there was no such alderman on the Chicago City Council.
Detective Vincent Wysocki's badge number was 6322 and he belonged to the 7th District.
This episode establishes there being an "Alderman Smith" on the Chicago City Council. At the time this episode aired, there was only one Alderman Smith and she was female (full name, Mary Ann Smith).
The voice of the disgruntled police officer who calls into the radio show is actually Chicago P.D. Homicide Detective John Folino's, who also works as the shows technical advisor.
When the three officers are lined up in Colvin's office, Bidwell is stood straight at attention, reflecting his prior service in the Marine Corps, whereas the other two are in a more casual stance.
Wysocki meets with his informant in a busy diner, wearing his police vest, badge and weapon, and makes no effort to keep his voice down. Yet when he first proposes using him to Evers, he makes it clear that he doesn't want his cover blown.
Dennis Mahoney notes the current Mayor of Chicago is Mayor McGinnis. In reality, when this episode aired, the Mayor of Chicago was Richard M. Daley, who held office from 1989-2011, making him the longest ever serving Chicago mayor.
When Gibbons is in the hospital with Sims and they are playing Xbox 360, you can see they are playing The Shield, which is a video game version of Shawn Ryan's most popular television show.
However, even though they are playing an Xbox 360, The Shield video game was only available for Playstation 2 and PC.
David Argyle's book is entitled "Too Many Children Left Behind - Fixing Public Education in America."
The last Cabrini-Green building is demolished in this episode. In reality, the last building was demolished on 30 March, 2011.
When Wysocki shoves the police officer for turning up twenty minutes late, the camera cuts to another angle. Before the cut, the officer is in line with the center of the patrol car, but after the cut, the officer is closer to Wysocki.
The song sung by the tenor at the memorial wall is called "The Last Rose Of Summer" by Sir Thomas Moore in the early part of the 19th century.
As well as being the youngest Superintendent, Teresa Colvin is also the first woman to hold the post.
Jarek Wysocki is a White Sox fan while Caleb Evers supports the Chicago Cubs.