The amount of squashed tomato on the police car's windshield changes.
Obvious day-for-night shot with the tank.
Gretta gets crushed by the giant killer tomato when you see her corpse she doesn't look like she was crushed.
During Dixon's intervention with Richardson, shadows of a crew member are briefly visible on the end table.
While Finletter chases a masked man that tried to kill Dixon through a park, the camera's shadow is visible on the ground and his parachute as it passes over the lens.