To find this slip up, go to the scene in the movie where Michele Pfeiffer(I don't remember her screen name) is paralyzed in the bathtub. If you look at the front of the bathtub you can see that there is a drain, so that the water in the tub would never overflow or get very high.(There are many chances to see the drain)At one point where the water is filling up closer and closer to her head you can see that the water has gone above the drain, but the water isn't draining out of the tub. This might have happened when the water was half way covering her face.(I don't remember which water level exactly)