When Morgan freeman & Brad Pitt investigate the 1st victim (gluttony), there's no electricity in the house.

When Morgan Freeman revisits the crime scene later, he flicks up temporary police lights which can be seen in the kitchen.

Yet, when he opens the fridge, the light inside the fridge is on...

furthermore, the small orange table light in the background is lit up as well.

If the police had put the electricity back in the entire house, why would they leave temporary spots light to illuminate the room (when the main light should work) and now that the tenant is dead, who would pay the electric bill anyway?

a small inconsistency which takes nothing away from the film :-)