After Brianiac infects the digital world with a virus, part of which causes a global blackout, we are shown scene's of New York and LA riots. In the New York footage the street lights and traffic lights are working.
The virus that Brainiac released caused elevators to shut down, among other things. When Lana gets to the roof of Luthorcorp, she should be out of breath, and sweaty from climbing all those stairs, but she looks like she has just taken the elevator.