Continuity mistake: During the opening scene, behind Jesse you can see the vice principal walk up behind her and reach out as he's about to put his hand on her shoulder, yet the very next shot of Lana, in the background you can see he's just exiting a room.
Continuity mistake: After the credit card company calls the Kent's to confirm purchases made the night before, we see Jonathan holding a mug by the rim. They then notice the music coming from Clark's barn and go to investigate. Cut to a different and now Jonathan is holding the mug by its ear.
Continuity mistake: When Pete and Jonathan corner Clark in the cornfield, Pete opens a lead box containing green kryptonite to weaken Clark. The position of how Pete holds the lead box changes every cut. At first he is holding it with just his right hand, then just his left, then both his hands.
Continuity mistake: When Chloe tells Pete about her discovery about the Red meteor rocks, she gives a sample to Pete who then looks at it. At this time the red meteor embedded in the rock is above Pete's left index and middle fingers. Cut to a close up of Pete's ring and the rock but now the rock is embedded in between Pete's left index finger and thumb.
Continuity mistake: After Jonathan and Martha talk about Clark's new behavior in the porch, we see Lana at the Talon sprinkling something onto a drink. When Clark was still walking towards Lana we can see that the pointed part of the container Lana was holding was pointing up. Cut to a different angle and now the pointed part of the container Lana is holding is pointing down.
Continuity mistake: While in the line to claim their class rings, Pete holds a folded piece of paper (probably his receipt). As Clark says: "I earned that money.", Pete starts to unfold the paper. Cut to a different angle as Clark continues: "Besides, my dad said." but now Pete is looking at a completely unfolded piece of paper.
Continuity mistake: When Clark gives his "I understand you, dad" speech at the table, he puts his left hand on his mom's right shoulder. She then holds Clark's hand with her right hand. Clark then walks across the table and as they cut to a wider angle Martha Kent's right hand is suddenly on the table.
Continuity mistake: At the bar, the agent looking for Jessie calls the barkeeper. He then proceeds to fold a piece of paper and puts down the pen which he was holding onto the bar. Cut to a different angle (as he takes out a photo of Jessie from his coat) but now the paper is unfolded and he is holding the pen in his hand again.
Visible crew/equipment: After the scene transition from when Clark throws Jonathan into the truck after being exposed to Red Kryptonite, the camera pans around Jonathan with his shirt off; on the left-side of the screen we see a man with sunglasses on who has no earthly right to be there just randomly on the Kent Farm. (00:16:23)
Other mistake: The physics of what happens to the mallet after it hits the ring are completely unrealistic. No matter what the actual composition of red kryptonite contains, there is no way that it could reflect all of the force that was impacted upon it. Clark was also weakened by the green kryptonite. Jonathan's swing of the mallet and Clark's weakened strength would not have allowed him to keep his arm out after being struck by the mallet.
Continuity mistake: While Clark is talking to the agent that he has pinned to the wall, with the billiard table, the balls near the gun change their positions between shots.
Continuity mistake: When the agent goes to the Luthor mansion and confronts Clark about Jessie's whereabouts, Clark uses his speed to push the billiard table into the agent and jams him against a wall. As he does, the billiard balls obviously move due to the force Clark put on the table. Cut to the agent and later on Clark and we still see the billiard balls on the table yet they are no longer moving. It was too quickly for an object in motion such as a billiard ball to come to a complete stop given the force Clark exerted on the table.
Continuity mistake: At the bar, the agent shows the barkeeper a picture of Jessie. Throughout the whole conversation, it is the agent who is holding the picture. However, when the agent says something about the legal drinking age in Kansas, it is the bartender who is instantaneously holding the picture.
Factual error: When Palmer is looking at the phone log, the wrong area codes are shown. Most of the list consist of the city of Topeka, with Wichita and Kansas City also seen, with a "206" area code. "206" serves the Seattle Washington area. The other area code seen is "620", which is a Kansas area code, but Topeka is in the "785" area code.
Answer: In the comics, Krypto is a dog from Krypton who was used as the passenger in a test launch by Jor-El, Superman's father, before he launched the actual rocket taking his infant son to Earth. Krypto's capsule was involved in a mishap, sending it out of Kryptonian orbit and eventually found its way to Earth where he linked up with the young Clark Kent. Like any native of Krypton, Krypto has superpowers on Earth. In Smallville, the dog is a standard Earth dog who has been experimentally injected with kryptonite, giving him super-strength for a limited period of time, who escapes and links up with Clark (who suggests the name Krypto, ostensibly because of the dog's cryptic origins). It doesn't take too long for the dog's strength to fade, and the Kents decide to keep him, although they ultimately name him Shelby, after a dog that Martha Kent had in childhood.
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