Broken City (2013)

Character mistake: In the scene where Billy is called to the crime scene of Andrews' murder, Andrews' body is shown with a wound on his chest. Later in the movie though, Billy is questioning Todd Lancaster. Todd Lancaster says that he saw Andrews get shot in the head. (00:52:00 - 01:25:00)

Mayor Hostetler: You know, women call men dogs. That's to suggest we're somehow untrustworthy or disloyal. But a dog is anything but. And if men are dogs, what the goddamn hell does that make women? You've ever seen a bitch in heat? She will grind herself across the grass to try and get her that itch. And she can find a way to sneak out of the backyard, as any dog will do.

Question: How does Wahlberg realizes that the head of police is the man sleeping with the mayor's wife?

AnthonyA