Visible crew/equipment: When the Angels are racing in the "Coal Bowl" we can see a camera on top of the bridge structure. Watch for a wide angle shot and you can see the camera moving at the same speed as the dirt bikes, at the very top of the screen.
Visible crew/equipment: When the O'Grady mob are fighting the Angels, Alex turns off the lights. Just after they flip over the men, you can easily see the harnesses at the top of the screen. (00:54:25)
Visible crew/equipment: As the Angels are all hanging on the blue car that Madison is driving in the end, you can briefly see the small hook at Lucy's stomach, that was keeping her secure. (01:31:45)
Visible crew/equipment: When Bosley is a crossing guard and is yelling 'Stop' at the oncoming car, lighting equipment is seen reflected in his glasses. It can also be seen reflected in the cars after the children have crossed. (01:10:40)
Answer: It is making fun of the show CSI. Even still, there are ways of telling if someone had a knee problem by the way they walk and put pressure on the foot. Being able to tell if it was a torn tendon, I don't think so. Check out the way people run and you can tell if they have hurt something in the past because of which leg they favor.