Plot hole: There is no reason for the prison guards to use portable computers in full view of the inmates to input the sonic deadline code. The guards can walk outside of the deadline whenever they need to input the code, or radio the guard on the outside to lower and raise the deadline like they do when bringing the workers out. In fact, this plot hole is compounded by the presence of the guards stationed outside of the deadline with their own computer, which makes the guard inside the deadline completely unnecessary. The interior guard is only there so Weiss has a way to get both the code and a computer, but this prison set-up makes absolutely no sense.
Suggested correction: The point of having a portable on the outside and inside is in the case of an attempted prison break, if one of the computers is taken by the prisoners, the other can be used to prevent the deadline from shutting down. This was actually shown in the prison break scene where Weiss was unable to shut off the deadline with the inside computer was because the guards on the outside one were countering any attempts to close it.
That only explains why there is a guard outside with a computer. There is no reason to have a guard on the inside of the deadline with a computer. There can't be a prison break if there are no guards with a computer on the inside, the inmate's heads will explode if they cross the deadline.
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: 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.
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).
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.
