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.
Stupidity: There was no particular reason for Nuclear Man to take Lacy into the space in the first place.