Revealing: There are times when it is quite evident that Michael Rosenbaum is voluntarily bald. Submitted by MoonFaery

Continuity: Season 7, episode "Persona". When Lana sees Bizzaro's face in the reflection of the glass, her hair is styled differently in her reflection.

Continuity: The Porsche that strikes Clark has no sign of impact when it goes over the side of the bridge.

Continuity: Clark's hands on the hood of Jeremy's truck shift in different shots from spread wide to in front of him and close together.

Continuity: After the meteor shower, the bit of hair that Mr. Luthor finds in the cornfield changes in his hands from stretched straight to curled.

Continuity: The meteors are shown traveling together in space at the beginning, but the smoke trail from the first meteorite runs perpendicular to the flight of the next one. They should be falling along roughly the same flight corridor, as all the other meteorites do.

Continuity: Closeups and wide shots on the Wall of Weird show different things next to each other. Watch the objects surrounding the finger article and the Wall of Fire article in the wide shot on Chloe, then look again at the closeups.

Deliberate "mistake": Clark's CPR form is terrible. When he performs emergency breaths on Lex, Lex's chest doesn't rise and fall, indicating that he's not actually breathing much air in. He doesn't bother to measure for the proper location for chest compressions, a very important step that is the difference between proper CPR and simply cracking ribs. As he performs compressions, he is not chanting the rhythm (one-and-two-and-three) and his elbows are bent. All of these were altered for dramatic reasons or the purpose of safety, but the sloppy technique probably would have killed Lex.

Continuity: The hole in the guard rail changes size and shape between the shot of Lex driving off it and another looking up at it from below.

Visible crew/equipment: When Clark finds Lex in the Luthor mansion, they walk down the hall and into a new room. As they enter, as Lex is saying "So, hows the new ride?" if you look in the bottom left of the screen you can see a white tape marker on the floor, where Lex will walk over to subsequently.

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.

Continuity: When Lex is about to hit Clark with his car, Clark alternates between facing the car and facing the bridge.

Continuity: Lionel calls his company Lexcorp, however in subsequent episodes it is renamed to LuthorCorp.

Continuity: When Jonathan lectures Clark about the danger of accepting gifts from Luthers, the key he twirls is a GM truck key, not a Ford truck key.

Visible crew/equipment: When Lex spins up to Luthor Corp in his car, as the camera pans over the car to follow him, the cameraman is reflected in the window as he pans over.

Plot hole: After Chloe shows Clark the Wall of Weird, Clark is confronted by Whitney outside. Whitney is wearing Lana's meteor rock (kryptonite) necklace but Clark actually feels no effects until he ends up opening Whitney's shirt.

Continuity: In the truck right before the parade passes them by, Jonathan Kent kisses his wife. Cut to a different angle but this time his left hand is on her cheek. It wasn't there in the prior angle.

Factual error: When Lex crashes his car lands on its roof, yet in the space of a few seconds it has sunk straight to the bottom, and turned the right way up. Cars don't sink that quickly.

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.

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.