Continuity mistake: As Richards and Buzzsaw are trying to overpower each other with the saw between them, the angle of the saw changes between shots. First, it's over Ben's left shoulder, then over his right as Buzzsaw talks. Also, when Buzzsaw talks, you hear the saw revving, but the chain isn't moving.
Continuity mistake: When people are walking into the building before you see where Amber lives, she is wearing her white robe and watches the news report that Richards shot the people at the airport at 'point blank range'. She says, "But that's not true!" and you can see Richards walking into the building wearing his work clothes at the bottom left corner. That scene had already been seen when Richards went to find his brother Edward, who lived in Amber's room previously. (00:27:53)
Continuity mistake: As Fireball deflects the barrel Richards throws at him, his flight jets disappear and reappear between shots.
Other mistake: When Killian's guard goes to enter his code to open the gate, it starts to open when he touches the first digit, rather than after the last digit.
Continuity mistake: When Richards is overpowered and pulled out of the pilot's seat in the chopper, his communications earpiece is still attached to him. As he's slammed into the back wall, it's suddenly gone.
Other mistake: In the opening sequence of the Huey flying over the crowd, the uniforms of all five men stay unruffled, despite the doors and windows being open, which would allow the wind to pass through.
Continuity mistake: When Amber and Ben are walking through the airport, and even when she hits him to flee, the group of people around them changes depending on the camera angle.
Continuity mistake: When Killian is talking to Agnes about the next kill, as she replies, "That's a tough one," her left index finger is on the corner of her mouth. After the camera cuts to Killian, the hand in several inches lower.
Continuity mistake: When Buzzsaw runs by Richards, cutting the pipe in half, he has the chainsaw on his left hand. The camera watches Buzzsaw turn around, and you don't see the chainsaw, as the rider's left hand is on the handlebar, controlling the turn. The camera cuts to Richards for a second, then back, and the saw is on Buzzsaw's hand again.
Other mistake: The list of possible prisoners contestants the computer goes through shows different information, but the page with the 8 rows of double letters and numbers remains relatively the same, even though it's suppose to show variations and different information (i.e. AA always has -583 and -5483 and BB always has -484 and -4838).
Answer: They needed a scapegoat, someone to blame. The government controlled the people through violence, but at the same time tried to convince the people the government was fair (i.e. Runners who made it through were given their freedom when in fact they never left the arena alive). The people at Bakersfield were still massacred (that part wasn't made up) by the government in order to control the riot, but just not by Ben. But people would just riot more if they knew the government ordered their killing, so the footage was faked to make people think Ben acted alone and against orders. And to continue the ruse, they convicted him to appease the people and prevent them from rioting.
Bishop73