Continuity: After Greg hits Clark with the pipe in the foundry, Clark's hands are very dirty. In the closeup on Clark's hand immediately after he lands, the hand is clean to show the effects of the Kryptonite.

Continuity: Despite the fact that Clark and Jonathan are looking in the rafters above them for Greg, their flashlights stay relatively level.

Plot hole: Clark goes to Lana's house to give her back the meteor rock necklace. As he is starting to put the necklace on the door knob. Lana calls for Whitney and you hear the "whoosh" of Clark using his super-speed to get away from the door. Kryptonite weakens Clark's powers so he should not have been able to speed away with the exposed necklace right in front of him.

Continuity: While researching Greg with Chloe, Clark changes from one hand on the computer mouse to arms crossed and back.

Continuity: Clark's hair goes from long to short and back to long as Clark, Pete and Chloe talk about Greg's tree fort.