Audio problem: Just after Dynamo kills Weiss, the next shot shows Dynamo approaching the camera. You can see Dynamos lips moving, and he's speaking, but you can't hear anything.
Audio problem: When Mick is talking about the network uplink being hidden, his lips don't move.
Audio problem: When Amber runs away from Ben the first time (into the bathroom), her words don't match her mouth, which tends to stay open with little movement, like the dialog was dubbed over her just screaming.
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