Factual error: When Christian Slater and Minnie Driver are trying to get out of the water before it reaches the transformer, there is a real big problem with this scene. If there really was a flood and it was rising that high, the city should have shut off the electricity to the entire city, to prevent any electric hazards that may happen in that situation.
Great sites
Mistakes
When Tom hides the money at the bottom of the "Portman" crypt, the water has almost reached the name on the crypt. But later when Jim forces Tom to bring the money back up the level of water has barely risen any in the last few hours. See more...
Trivia
The original title of this movie was "The Flood." See more...
Hard Rain mistakes
Audio problem: When Jim has been pushed out of the boat by Sheriff in the church, his voice is heard echoing "no" at exactly the same time that he is spitting water out visually.
Character mistake: Just after the shootout between the robbers and the armored truck drivers at the dip in the road, the teacher that is with the robbers pumps the shotgun about 3 times, without firing a shot after they crossed the water. This would just waste a perfectly good cartridge, since they hadn't been shot yet.
Hard Rain trivia
The original title of this movie was "The Flood."