Continuity mistake: In the beginning of the movie when the Angels are rescuing the US Marshall, Lucy Liu is wearing stiletto heeled boots. When they jump out of the window, the heels are square. (00:01:30 - 00:06:40)
Continuity mistake: When Demi Moore shoots the Angels off the side of the observatory, the bullet intended for Drew Barrymore hits her in the lower abdomen. Later in the movie when the Angels wake up on the lawn below the observatory, the only bullet hole in Drew's shirt is on her upper left chest. (01:17:05 - 01:20:25)
Continuity mistake: When the Angels are walking through the sprinklers after getting shot, you can see the bullet holes in each one of the Angels' shirts. When they get to the car, and it blows up, Cameron Diaz's bullet hole disappears. (01:20:00 - 01:21:30)
Continuity mistake: In the dirt bike racing scene, there's a long "slow-motion" shot that includes a large section of a very patchy-cloudy sky. In all other shots of the race, the sky is clear blue. (00:32:45)
Continuity mistake: When the Angels get shot off the observatory, Natalie is between Alex and Dylan. When the next shot shows them on the ground, Natalie is on the far right, past Dylan. (01:17:15)
Continuity mistake: When the Angels are walking through the sprinklers, they get soaked. But after their car blows up and they are lying on the ground Drew Barrymore's hair is dry along with Lucy Liu's. (01:21:30)
Trivia: Mary Kate and Ashley Olsen have uncredited cameos in the scene where Drew Barrymore imagines herself with replacement Angels. (00:27:20)
Continuity mistake: In the roof fight, Dylan gets knocked off the roof and grabs the fallen E. Her hands were holding on to the lower piece, but in the next shot her hands are at the top.
Continuity mistake: When Natalie jumps into the boat she is wearing flat heeled shoes, but in the earlier fire scene she is wearing black stiletto boots. (This is visible in zoom and slo-mo.) (00:58:55)
Continuity mistake: At the end of the Angels' last fight with Demi Moore, we get a closeup of Demi's mouth. It is bloody and her teeth are covered in red. A few seconds later, after she falls backward through the floor and begins to scream, there is no blood on her face and her teeth are pearly white. (01:35:10)
Continuity mistake: When Alex is rescuing Ray Carter, the blood on his shirt is on the right hand side. When Ray says, "Ah, my ribs", the blood is on the left hand side. Afterwards, the blood's on the right hand side.
Continuity mistake: When the Angels are sitting at the desks talking to mother superior, she asks the Angels to move forward. Watch Cameron Diaz. The first time she grasps her desk to bring it forward, it's on the front bit. Then it shows a shot from behind and she is grasping it from the sides, then back to the front shot and she is grasping it from the front again. (00:41:45)
Continuity mistake: At the start of the rooftop fighting scene, Madison opens the door and leaves it open. When the Angels pull her guns apart, the door is closed.
Continuity mistake: When the Angels find the photos on Emmet's body at the coal bowl, the picture of Helen Zaas shows her holding her Lucky lighter. If you look closely, you can see that it is completely different to the Lucky lighter which Dylan carries. The stars part of the 'Stars and Stripes' design cover the whole lid on Dylan's lighter, but on Helen Zaas's lighter it only covers half of the lid. (00:59:50)
Continuity mistake: When the cute assassin comes up to start the bike race, he has no top on and his upper torso is bare, however in the next shot he has a red racing jersey on. (00:31:10)
Continuity mistake: When Bosley (as a crossing guard) is in the middle of the road, attempting to stop Ray Carter in his car, the waiting children disappear and reappear between shots. (01:10:40)
Continuity mistake: When Alex and Natalie are chasing the man in the car, the headrest changes from black to red. (01:10:20 - 01:11:15)
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.