Revealing mistake: There are times when it is quite evident that Michael Rosenbaum is voluntarily bald.
Revealing mistake: While there was a close up on Clark while he was asleep, you could see a small cut right above his eye, which is impossible if he can't be hurt.
Revealing mistake: In the scene in which Jonathan shoots Lex, he is gently lowering and raising the barrel of the gun whilst shooting, even though there is a 'bullet-time' effect in progress. Maybe the sequence is shot in real-time, with the actors standing still and the 'bullet' added afterwards? Furthermore, would Lex really move that quickly in relation to the speed of the bullet?
Revealing mistake: Once Victoria has drawn her bath, we see her get in, and then lean back into the water. However she is already wet on her chest and her hair is damp already. This is probably due to previous takes of the same scene.
Revealing mistake: When Lionel Luthor visits the Kent Farm and tells the Kents and Chloe that Lex is missing, Allison Mack is laughing when the group is shown from Lex's viewpoint in the barn.
Revealing mistake: When Lana throws a glass bottle at Lex (in the Talon) it smashes against the wall. But if you look closely Lana drops the bottle just before she throws it.
Revealing mistake: As Tyler slides across the floor, after Clark knocks him out of Whitney's father's room, he hits the camera. When he does the camera has a noticeable shake to it because of it.
Revealing mistake: While Lana is listening to her Mother's graduation speech she reaches up to her neck for her meteor rock necklace. Her hands do not reach far enough back to unclasp the necklace yet the necklace comes off anyway.
Revealing mistake: In the early scene with the baby, there are a few overhead shots of the parents and child. It is clear that in these shots a fake baby was used - he is completely motionless, even though he was moving arms and legs before and after and is crying. (00:02:00 - 00:03:15)
Revealing mistake: Kristin Kreuk's body double in the shower scene is noticeable. She is slightly larger and differently shaped.
Revealing mistake: At the beginning, Lional's limo comes to a screeching halt on railroad tracks. The camera is panned out to where you can see this happen. The black tire marks that are supposed to appear from the hard braking are already present, which means there were multiple takes.
Revealing mistake: When Lucy plays her violin in Lex's mansion, it's obvious the actress isn't actually playing - her fingers aren't moving and the box is out of time with the music.
Revealing mistake: When Clark split's the fence at Belle Reve, just before he pulls it apart you can see the breakaway part of the fence. It is a silver color compared to the gray of the actual fence and runs vertically in front of Clark and between where he puts his hands.
Revealing mistake: As Sheriff Ethan pulls up there is a reflection on his driver side window. You can see the police department shield on the door and the door handle reflected on the driver's side window. There were no other police cars there so it was probably reflected off a mirror used to help light the scene.
Revealing mistake: Lana and Clark are supposed to be skinny dipping at Crater Lake. When Clark pops up out of the water and goes "boo" to Lana she spins around and splashes Clark for making her worry. As she starts to splash Clark her body comes out of the water far enough to see she is wearing a tan tube top instead of actually skinny dipping.
Revealing mistake: As Tina/Clark tries to run over Martha, there is a shot of Tina/Clark up close in the truck, and the gear shift is still in park.
Revealing mistake: The Smallville Torch that Clark looks at online is the exact same one last seen by Lex two episodes ago in "Craving." This wouldn't be a problem, but Clark remarks that this Torch is "another scathing editorial," indicating that it is new, and Principal Kwan complains that parents have been calling all morning, which means that this issue of the Torch was published either this day or the day before. Prop department must have been saving money. (00:08:40)
Revealing mistake: When the gas pipe explodes at the beginning before the credits, the camera goes to an aerial view. You can see that the explosion started from behind the gas pipes. (00:01:50)
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