Revealing mistake: There is a scene where Natalie Cook is on her surfboard riding the curl of a wave. It appears to be her head superimposed over someone else's body. The coloring and movement don't quite line up. (00:24:10)
Revealing mistake: When you see the picture of Alex and her parents in front of the Eiffel Tower, her face has obviously just been added into the photo, which is shown because the lighting is different and she is wearing the same top as she was when she was in the office with the Angels, talking to Max. (00:43:55)
Revealing mistake: When Madison is shooting at the Angels at the observatory the gun in her left hand is empty and the slide is locked open. She then continues to shoot with both guns. (01:14:45)
Revealing mistake: Whenever a car explodes in the movie, the car splits exactly in half, with each half having a straight edge. (01:21:25)
Revealing mistake: When the Angels are fighting on the rooftop, Demi Moore stands on another building nearby with a dress and a thing around her hands. Her hands aren't free obviously, but as she peeks through the telescope you can see the ocular moving around following the Angels and when the shot ends, her hands are still in the thing. (01:26:10)
Revealing mistake: When the Angels are swinging on decoration lights to catch up to Demi Moore in the Shelby, there's no way those lights can swing that far or be strong enough to hold the weight of a person. (01:30:50)
Revealing mistake: Just after Madison says to the Angels, "Looks like one of the three amigos has gone adios" and Drew gets thrown by Madison, Drew hits the wall. For some reason, the camera vibrates.
Revealing mistake: When Natalie is thrown into the rooftop frame by Madison, Cameron Diaz's stunt double is visible.
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.