Stupidity: At the prison yard, when Weiss overhears that the sonic deadline was being deactivated to let new prisoners in, he manages to look at the deactivation code. The guard sees Weiss looking at the code and switches the computer off. If he had changed the code and informed another guard, none of the prisoners would have escaped.
Suggested correction: The prison riot happens mere minutes after this. We don't know what it takes to actually change the password and whether or not the guards have the authority to do so. The real stupidity is why the guards would be using portable computers in full view of the inmates when they could easily walk on the other side of the deadline to do so.
Revealing mistake: During the prison break at the beginning Richards grabs a guard and says "How about a lift?" You can tell it's a dummy.
Suggested correction: I've watched this scene many times and still cannot tell if it's a dummy.
Look at the guard's limbs.
What about them? Still, nothing that points to the guard being an obvious dummy.
If you look at the guard's limbs, they are completely stiff and barely move. If it was a real soldier that was being thrown, he would have been flailing his arms around and trying to free himself. It is most noticeable at 00:06:51 that the guard is a dummy.
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.
