Continuity mistake: When they arrive at the airport, Matrix closes the door of the car, and the window is almost closed. But, in the next shot, when Bennett says that he'll be ready, he is looking through a completely open window.
Continuity mistake: When Matrix leaves the plane rowing a boat there are two angles on Cindy: In the close-up her hair remains still, but in the wide angle there's a strong wind blowing it. This changes back and forth.
Continuity mistake: After the rocket-launcher scene Matrix's daughter is sitting on the floor with a wrinkled curtain at her feet. A shot later the curtain is less wrinkled.
Continuity mistake: When Arnold is crashing into the gun shop in the caterpillar you can see the camera to the rear (a black round one) and then also the camera at the front can be seen as a yellow box, attempting to be disguised as part of the engine block. These quickly disappear in subsequent shots.
Continuity mistake: During the motel room fight scene when Cooke crashes into the other room, the door separating the rooms changes between shots. When he first crashes through the door it's just a wooden door with a large brass knob, but when he lands on the floor in the other room the door is now surrounded by a white frame and the knob is visibly smaller.
Continuity mistake: After killing Henriques on the plane, Matrix asks the flight attendant how long the flight to Val Verdes is. When he asks her the question, her hand is on the curtain separating first class from economy, but in the next shot her arm is by her side when she answer's Matrix's question.
Continuity mistake: In the dealership, Cooke never shifts the Cadillac into reverse, and yet instantly starts backing up after he says he likes "the price." The car would have had to be in Park or Neutral in order to be cranked up and would not start in gear.
Continuity mistake: In the final fight scene Bennett opens a furnace door into John's face, knocking him to the ground. When he opened the door it was two half-doors that opened together, yet in the next shot when he rips the door off to throw at John, only the bottom half is still there.
Continuity mistake: After Matrix's daughter puts ice cream on him, the ice cream on both him and her's changes from higher and lower positions between shots.
Continuity mistake: During the initial credits, the amount of ice cream on Matrix's nose and lip decreases between frames.
Continuity mistake: Right when the fight between Matrix and Bennett begins, the Uzi submachine gun vanishes from Bennett's right shoulder (it was on a strap). Then suddenly at the end of the fight (after the fell down over the railing and to the next level down, the Uzi reappears when Bennett picks it up and attempts to shoot Matrix. Bennett lost it on the upper level nowhere near the railing, and it somehow appeared on the lower level away from the railing.
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.