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.

Continuity: After Clark catches the football the was aimed at Chloe, for taking pictures of the team, she has one hand on her camera, but in the next shot, both hands are on the camera.

Plot hole: Why does the principal leave so calmly when Coach Walt starts a fire in his office? He doesn't even bother to call 911, he just walks out to his car and tries to drive away.

Continuity: 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: While Clark and Jonathan are talking about Clark being on the football team, Jonathan puts his hands on Clark's shoulders. Between shots, the position of Jonathan's hands on Clark's shoulders repeatedly changes.

Continuity: Near the beginning, Clark, Chloe, and Pete walk past Lana and Whitney. In the following exchange between Lana and Whitney, two cheerleaders suddenly appear behind them. They're gone again as Lana walks away.

Deliberate "mistake": The episode begins with a football game in pouring rain. After the winning goal is scored, the crowd shots show the cheerleaders' hair wet and their uniforms completely dry.

Continuity: During Clark and Pete's exchange after the coach invites Clark onto the team, Pete's hand zips from at his side to raised to his shoulder in an angle change.

Factual error: 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: 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.

Continuity: Tina's grip on Lana's necklace changes as she stands over Lana's body.

Continuity: While climbing ropes in the gym, Clark and Pete switch sides relative to each other. First Clark is on Pete's left, then he is suddenly on Pete's right.

Factual error: Lana says the theme of her mother's prom was Saturday Night Fever, but she was in the class of 1977 and the movie didn't come out until December of that year.

Visible crew/equipment: After Martha finds the money in the antique shop she tells the other woman she needs to be more careful, as they are walking in the room there is s boom mike shadow moving.

Continuity: When "Lex" threatens the bank manager, he points the gun at his face, but the next shot on the manager shows the gun at his throat.

Audio problem: Sean drops frozen Jenna and she shatters. He then manages to casually walk out of the room over her without crunching any of the ice.

Audio problem: While Sean and Whitney are tossing the football at the lake edge, at one point we hear Whitney catch the ball offscreen while the camera is on Sean. The camera then cuts back to Whitney and he catches the ball on screen.

Plot hole: Chloe writes her phone number on Sean's hand. It disappears when we see him struggling against the ice of the lake, then reappears in the scene where he is calling old girlfriends. And how exactly would pen ink survive several hours submerged in water and then another eight hours of normal activity without becoming blurred?