When Lukas opens the sin box there's two balls in the box. He takes one and infects Officer Dean with anger. When the shot goes back to the box it's empty, there should be one ball left.
When Lukas opens the box to give wrath (anger) to the officer there should only be one sin left not two since greed was given to the man killed by the bus, lust to Phoebe, gluttony to Piper, sloth to Leo, envy to Prue and pride to the Pastor.