Pay in Pain - S1-E7
Audio problem: When Mackey is interrogating Leon the camera is pointed at Mackey as he asks Leon "why are you and the other shop owners all telling the same lie?" The camera then switches over Mackey's right shoulder so we can see Leon's reaction to Mackey's question. Look closely at Mackey's mouth in this shot, you can see him mouthing the exact words that he just spoke.