Factual error: Clark huddles over Krypto to protect him from the blast of the exploding van. He does not cover Krypto's head before the blast of fire hits them yet Krypto shows no sign of damage. At the very least the fire should have singed his fur.
Other mistake: Lois digs up Chloe's grave site to unearth her casket. It is obvious that the casket is not buried six feet deep. You would think, with all that is going on, that LuthorCorp would have at least buried the casket deeper to deter inquisitive eyes and maybe throw in a few scattered bones for good measure.
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?