Corrected entry: At the beginning, the city is being evacuated. We see a helicopter flying around the city. The lights in the buildings are on - why would they be, given that everyone in the city is on the bridge being evacuated? (It's not because they're automatic, because in several of the buildings some are on and some are off.).
Moose
13th Oct 2004
Correction: Some automatic lights have motion sensors to turn them off if no one is there, but many don't (or are disabled) even in the same building. I used to work in a building where the motion sensors would start to work only after a certain time at night which would be adjusted according to the work habits of each department, i.e. some could start turning off at 5pm, some 8pm, some 24/7, etc.
Myridon