Other mistake: Kim and Al chase the suspect into a wooded area. As Al is walking through the woods there is a puff of smoke from behind the the trees in front of him, but the suspect steps out from behind him.
Chicago P.D. (2014)
1 other mistake in season 4 - chronological order
Starring: Sophia Bush, Jason Beghe, Patrick John Flueger, Jesse Lee Soffer
Character mistake: When Ruzek and Voight are questioning Wade Henslow (the father of missing girl) at the station, after finding out he lied and set up his own security to find his daughter Adam looks at Wade Henson but addresses him as "Mr. Larson" which is actually the last name of one of the kidnappers they found DOA who got into the gun fight with his security guy, the ex-cop Kenny. (00:21:26)
Question: If Voight's a dirty cop and everyone knows it why tolerate it? Why not set up a sting and take him down?
Answer: Also, if you watch Season 1 of Chicago Fire it gives a little history of Voight before he goes to jail when he was actually a "dirty cop" and Antonio Dawson is actually the one who takes him down. I found it interesting and was surprised by his character back then.
Answer: And cuz he's only dirty to the bad guys. He takes care of the victims.
Answer: Because he is a great cop and gets the job done better than anyone.