After the bad guys are shot at in the abandoned building, the camera shots keep changing from the cop on stakeout at the front of the building to the shooter getting rid of the evidence - his gloves, shoes, the gun. A couple of the scenes show it raining, but mostly it's not raining.
After the assassin shoots Ted Warren in bed, one of the crew members (either the camera operator or the boom operator) is seen in the window's reflection.