Visible crew/equipment: At the start, when Erin is interviewing Miranda they take a break, and just as Miranda says she's starving and stands up, the red T-mark is visible on the floor in front of Anthony's feet. (00:00:55)
Visible crew/equipment: After the family dinner, when it cuts to Jamie standing at the sink loading the dishwasher, the green T-mark is visible on the floor behind his feet. (00:29:10)
Answer: It's a common cop show plot device. If the police on the show always acted in the most logical way (i.e. not alerting a suspect to their presence) the show wouldn't have the opportunity for an exciting foot chase.