The Crown Point (Lake County), Indiana sheriff is wearing an Indiana State Police badge on his sheriff's uniform.
When Atwood finds the Metcalf "Perv Hunters" video he's listening with his headphones. When he turns the monitor to show the team, the headphones are still plugged in but the audio is coming from external speakers.
In order to get the killer to come out, Kevin uploads to YouTube a video of Al pretending to be a pedophile. By posting a video of one of its officers on the Internet, the Intelligence Unit ensures that Al can no longer work undercover; his likeness is now permanently online, even if the original video is removed.