Other mistake: When he takes Lana to the Fortress of Solitude, Clark squeezes a rock and when he opens his hand we see a perfectly cut diamond. Problem here is that in the real world, diamonds don't come out of the earth already cut and shaped. (00:04:20)
Smallville (2001)
41 mistakes in season 5
Jonathan Kent: Are you okay?
Clark Kent: Can I answer that in about five years?
Jonathan Kent: Yeah.
Clark Kent: Dad I'm glad you and mom are the ones that found me.
Jonathan Kent: We didn't find you, Clark, you found us.
Trivia: Jerry Siegel, the co-creator of the Clark Kent/Superman character worked on a school magazine when he was at Glenville High School, Cleveland. The magazine was called The Torch - the same name of Smallville High's school magazine, edited by Chloe Sullivan and with Clark Kent as an on/off contributor.
Question: Why does Clark keep burning his "S" symbol on the sides of buildings after saving someone? I get him doing it under the influence of red kryptonite, but at this point it just seems like vandalism that Superman would never do. Clark even saw Chloe having to scrub his mark off the wall of Watchtower, which wasn't an easy task. And if it's meant to be a symbol of hope against crime for the people of Metropolis, why burn it into the side of the refinery in Smallville after putting out the fire?