Revealing mistake: In the scene in which Johnathan shoots Lex, you can see 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?
Continuity mistake: As Lex is chalking his pool stick while talking to Dominic about cutting 20% of the workforce at the LutherCorp Smallville plant, there is a red snooker ball on the wall rack missing from the second row. When Lex walks over to the other end of the pool table, the camera shot changes back to Dominic, now there is a ball missing from the top row, which was not missing before.
Continuity mistake: When Martha Kent and Lana were talking about the meteor shower in the Talon Relief Center they sit down on the stairs. Lana puts both her hands on her knees. But in the next shot now her arms are outstretched in front of her, and now it's her elbows which are on her knees.
Audio problem: When Mr. Luthor was buying the corn field from the farmer he says: 'Now, where do I sign?' The farmer replies: 'Right here Mr. Luthor' and points at the contract. Even though we can only see a profile shot of the farmer as he says these words it is pretty obvious that his mouth isn't moving.
Plot hole: In episode 4-16: "Lucy," there is no reason for the criminals to be chasing Lucy on the ski slopes at the beginning of the episode. We learn later that she's been working with them all along; she calls Lois during the chase, and the call is part of Lucy's plan with the criminals. Lucy being chased by the criminals would make sense given the story she gives Clark during the next part of the episode, but it doesn't make sense for what we ultimately learn is the truth. And nobody from Smallville is anywhere near the ski chase, so it also doesn't make sense as any kind of a ruse.DavidK93
Audio problem: In the beginning of the episode, Clark leaves for the Talon to meet with Pete. He is offered a ride by his mother, but says he'll run there instead. As he closes the door behind him, we hear the sound of him taking off in super-speed, but we can still see him through the glass in the door moving down the stairs in normal speed.