Continuity mistake: When the deputy sheriff comes out of the house, her ink pen is sticking through the hole in her pocket flap but not in the pocket itself. After she turns around at the car, her ink pen is inside her pocket and not "flapping" loose as it was just a split second before. (00:21:15)

Signs (2002)
Ending / spoiler
Directed by: M. Night Shyamalan
Starring: Mel Gibson, Joaquin Phoenix, Abigail Breslin, Rory Culkin
The aliens are unable to break into the cellar. Hearing on the radio that the space ships have left Earth, the family emerges. The invaders are seemingly gone, but when Graham and Merrill go into the living room, they are confronted by a stranded alien. It is carrying Morgan and about to shoot deadly gas into his face. Suddenly recalling his wife’s dying words, Graham tells Merrill, a failed semi-pro baseball player, to "swing away." Merrill grabs his old bat from the wall bracket. The threatened alien releases the gas and drops Morgan to the floor. Graham grabs Morgan, who’s having an asthma attack, and rushes outside to give him a life-saving injection. Meanwhile, Merrill attacks the alien with the bat, and after a fierce struggle, kills it. Morgan survives, his asthma preventing him from breathing the poisonous vapor. Graham believes this was God’s way of saving his son. His faith restored, he returns to the pulpit.
Graham Hess: Swing away Merrill. Merrill... swing away.
Trivia: When the alien's hand comes out of the coal grate for Morgan, if you look closely you will see that the hand was already through the grate and the alien was using its colour changing abilities to hide. So if you look very closely you will that that the hand comes UP from the grate and not through it, and if you look VERY carefully you can see the outline of the hand even before Morgen says "What?"
Question: First, let me say that the aliens being affected by only the "contaminants" in the tap water seems to be wrong. Two reason: 1)The Indian vet mentions that they don't like water, and 2) the aliens were avoiding areas with large bodies of water nearby. My question is this: wouldn't humans, who are over half water, be toxic to the aliens? Even if they processed the humans with different equipment and took precautions to avoid blood or body fluids, wouldn't carrying off a sweaty person burn the aliens? Seems like a dangerous harvest.
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Answer: It could be that they are affected by the chlorine in the tap water (humans are affected by chlorine to, just look at Mustard Gas) to a greater extent then humans. The vet is only speculating about the landing sites. And while it is true that humans are mostly water, it is saline (i.e. salty like sweat) and has different chemical properties to pure H2O.
Soylent Purple
Well water does not contain chlorine.