Revealing mistake: Just before we see the boat explode at the start, a wire/cable holding the boat in place can be seen at the bottom of the screen. (00:04:10)
Revealing mistake: In the beginning of the movie when Matrix goes to get his rifle from the shed, he uses a combination on the keypad to unlock the door but the door was already half opened. (00:12:25)
Revealing mistake: During the scene where Matrix is attempting to push his truck down the hill, pay close attention to the shot where the truck starts rolling and Matrix jumps into the cab - the cable controlling the truck is visible to the right of the rear tire. (00:14:10)
Revealing mistake: As Matrix's truck crashes at the bottom of the hill, you can see smoke coming out the tail pipe even though the truck is supposed to have been electrically sabotaged. (00:15:05)
Revealing mistake: When Matrix jumps off the plane's front landing gear, in the first shot of him jumping, if you look very closely you can see that Arnold Schwarzenegger's stunt double is black. (00:24:40)
Revealing mistake: When Cindy and Matrix enter the parking lot, Matrix / Arnold's stand-in is very noticeable, haircut and colour completely different. (00:31:05)
Revealing mistake: There is a scene in the mall fight between Matrix, and the security guards when he knocks one of them over a railing you can see the cord that's attached to the security guard's right ankle as he falls. (00:34:45)
Revealing mistake: When Matrix grabs the phone booth, it has no screws or wires connecting it to the floor, wall or anywhere. Furthermore, the only spark it produces starts a metre away from the booth. (00:36:10)
Revealing mistake: In the close-up, Matrix is seen grabbing a balloon, but in the wide-angle he is swinging himself grabbed to some sort of safety harness and wire in the balloon. (00:37:10)
Revealing mistake: The stunt double for David Patrick Kelly is seen driving the car, just before he crashes through the gate of the parking garage. (00:37:50 - 00:40:10)
Revealing mistake: Just before Matrix crashes the red car there is a shot with just 1 person in it. The woman has vanished. (00:38:30)
Revealing mistake: When Matrix sends Sully to his death by dropping him off the edge of the cliff, in the shot of Sully falling it is an obvious dummy. (00:39:20)
Revealing mistake: When Matrix crashes against the pole, in the aerial angle a bulky dark object flies away from the driver's passenger seat. Maybe the mannequin's head, or a prop of some sort to simulate for Cindy. (00:40:15)
Revealing mistake: When Arnie hits the telegraph pole with the red sports car, you can see Rae's "dummy" head go flying off over the windshield. (00:40:18)
Revealing mistake: During the fight scene with Matrix and Cooke at the Motel, the stunt double for Cooke (the bald black guy) looks nothing like him and can be seen during many parts. (00:47:24)
Revealing mistake: When Cindy fires the second rocket at the truck, you can see the explosive device on the road next to the truck just before it gets hit. (00:54:20)
Revealing mistake: During the stunt where the police van flips over (as a result of the rocket launcher attack) you can see the telegraph pole section used to flip the van over. It rolls down the road. (Stunts involving flips rely on a mini pile driver under the vehicle, as opposed to using an explosive charge by itself which can be too unpredictable). (00:54:55)
Revealing mistake: Just before the guard in his tower gets killed and falls out, you can see the wooden sides have been precut. When he supposedly falls through the wood it parts along the cut line but remains hanging on string. (01:10:48)
Revealing mistake: When Matrix hits the button to blow up the village, you can see that there are only cardboard stand-ups of men next to the buildings blowing up. Also, for some reason the top of the watch-tower also blows up even though Matrix never put a bomb there. (01:11:00)
Revealing mistake: When Matrix reaches Arius' mansion (in actuality the Harold Lloyd Estate), he is rushed at by several soldiers of Arius' private army and starts shooting at them with his RPK. In one shot from Matrix's rear we can see him shooting four soldiers at the same time. However, the two soldiers on the far left drop dead even though Matrix is aiming his weapon to the right. (01:11:40)
Answer: Possibly so any surviving enemies they encountered on previous missions and or tours of duty couldn't hunt them down and kill them for revenge.