When the police enter the hotel room for the first time, the police officer charges Naina Sethi with murder. The officer has not even seen if the intended murder victim is breathing or not as he is lying face down so how could he know without touching him that the victim is dead. He couldn't charge Naina Sethi without first ascertaining if the victim is dead or not.
In one of the shots when Naina Sethi slams the trunk door on Sunny Singh after realizing that he is alive and pushes the car into the swamp, the car is shown going down into the swamp/lake vertically like it has been dropped into the center of the lake. The car was pushed into the lake and should have gone down at an angle and not vertically.