Continuity mistake: As Clark jumps the fence, to stop Jonathan from falling, you can see Martha is standing in sunshine with the shadow of the barn well away from her. When Clark actually catches Jonathan suddenly Martha is standing in the shadow of the barn.
Continuity mistake: When the weather vane falls to the ground the rooster portion of the vane gets bent. When Jonathan picks it up and starts to angrily walk away from Martha and Clark it is straightened.
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?