During Brainiac's attack on Metropolis, while in the Daily Planet, Lois takes a rolling chair, smashes it into one of the robotic sentries, sending it through a window.
It is shown the windows are clearly not floor to ceiling when the scene cuts back inside the Planet building. There's no way the robot could have simply rolled through the window.
While in Kandor, Superman smashes the ground several times in order to get Brainiac's attention. He lifts a huge chunk of ground to throw at one the robotic guards but, not only is there no hole where the chuck has come from, the ground beneath and around him shows absolutely no sign of damage.