Continuity mistake: While Lana is climbing the windmill, just before she stops a shot from below shows her right foot right above her left foot. The camera switches to above her and suddenly her left foot is a full rung above her right foot. (00:27:10)
Continuity mistake: When Chloe is first asking Pete and Clark the questions for her poll you can see that the top page on her clipboard is yellow. Then she shows it to Lana and the camera gives you a nice big shot of the front piece of paper and it is white. When Chloe says "its unleashing the inner Lana." the front of the clipboard is shown again and now the paper is yellow.
Continuity mistake: When Lana and Clark are sitting on the Windmill and the camera is facing them close up you can see the shadow of the windmill moving in the wind but when the camera zooms out the windmill is not moving at all.
Continuity mistake: Fordman's, the store Whitney is helping his father run, is directly across the street from The Talon. The store has a big blue sign out front with "Fordman's" written in large white letters. After Lana steals Lex's car, she drives down the street and the store is nowhere to be seen on the other side of the street.
Continuity mistake: When Chloe puts the photo of Dr. Hamilton on his desk she puts it on a book next to his arm. After the shot changes he is shown picking up the photo but now it is half resting on his arm.
Continuity mistake: When Lana and Clark are sitting on top of the windmill, Clark's jacket changes from opened to closed to opened.
Continuity mistake: As Pete demands Chloe's keys he raises the gun on her. As he does you can hear the sound of the hammer being pulled back on the revolver. In the shot of the gun, as Chloe gives him the keys, the hammer is not pulled back.
Continuity mistake: After Lex tells Martha that he'll do whatever he can to help Jonathan, she goes into Jonathan's hospital room. As she goes through the door, the blinds next to the door are closed. When the shot switches to show Clark standing at the other window, the blinds next to the door are open. Then, as Lex goes over to Clark, the blinds next to the door are closed again.
Continuity mistake: When Jonathan shoots Clark with the shotgun, in the slow motion shot of Clark as he first starts to take the hit there is nothing coming out of the gun or on his chest. When the shot moves to Clark's left he now has red hot shot fragments on his chest.
Answer: The kryptonite only creates mutations when it reacts with the environment and an individual. Remember, the FDA and several environmental groups did check out Smallville after the meteor shower, but found no danger in the rocks. Obviously they're not always emitting mutating rays, or all the flora and fauna of the surrounding area would be horribly mutated.
Phoenix