Carnage (2011)

Continuity mistake: When Alan is taunting Michael about selling door knobs and Michael's back is against the door frame to the dining room, the dining room is dark; both chandeliers are off. All four characters are in the living room but as Michael responds to Alan's taunts, the lights are on, even though no one entered that room and Michael's hands were in his pockets during the exchange.

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Alan Cowan: Morally you're supposed to overcome your impulses, but there are times you don't want to overcome them.