Continuity mistake: After Clark sees Whitney and realizes that he may be Tina Greer the next scene is at the school newspaper The Torch. The first shot of the computer, as the camera pans past it, has a story about Whitney's return up front with the story about Tina Greer's "suicide" behind it. Even though nobody touches the computer in the time between shots the next shot of the screen has just the story on Tina Greer and Whitney's story is completely gone.
Audio problem: After Perry explains that the information he has on Lionel is with "multiple attorneys with 'in the event of my death' instructions" Perry tells Lex that the information is "all yours". As he says "all yours" the camera is behind and you can see Perry's mouth say "I just want one thing." but you don't hear Perry actually speak the line until the camera has switched and is facing Perry.
Continuity mistake: After Adam says "Look who's talking." you can see Lana raise the notebook she found as she starts to respond when the camera is behind her. When the camera jumps to the other side, facing Lana, the notebook is down instantly between shots and she has to raise it up again.
Continuity mistake: In the kitchen, Martha collapses and Clark catches her just in time. Jonathan then rushes to his wife and puts his right hand on her cheek and his left hand on Clark's shoulder. Cut to a close up of Martha as Jonathan calls her name but now he has both his hands on Martha's face.
Continuity mistake: As Clark walks into his grandfather's motel room, his hands are behind his back. He turns to face his grandfather and both hands are now in front of him holding the photo album. The next shot shows him in the foreground raising his left arm from his side to hold the album. (00:31:30)Phoenix
Visible crew/equipment: Just after Becker starts to chase Lucy there is a shot looking up the hill towards the lodge where she started skiing from. To Lucy's left you can see a fresh pair of ski tracks being made by whatever the camera is on. You can tell these are fresh tracks because there is fresh snow being kicked in the air because of them.
Plot hole: Outside the school, as Clark is talking to Jordan, there is a lot of people in the surrounding area. Clark looks up and sees the coach standing in the street and the car slams on its brakes to avoid hitting him, this causes the tires to screech thus drawing attention to the incident. Clark realizes that the coach is about to be hit by the car and uses his super speed to save him. Yet nobody seems to wonder how he suddenly appeared next to the coach just in the nick of time.
Continuity mistake: After the encounter in the meat locker, Lex and Clark talk outside Fordman's store. As Lex turns to leave there is a truck driving down the street in Clark's direction. When the camera switches to Clark, the truck, which should be in this shot going behind Clark, is nowhere to be seen.