Audio problem: In the scene where Jason and Isabelle/Lana are talking and he is about to burn the book with the lighter, she quickly grabs the book with her magic. Isabelle then says some sort of spell flinging Jason against the wall to the right. In the shot where you see him thrown against the wall, Isabelle has already said the spell, but you can see her mouth moving saying the same thing (though nothing is heard).
Continuity mistake: While Martha reads to Jonathan, as he is in a coma, the light on his hands change. In the shot from the right side of Jonathan's bed his hands have only a normal level of light like from a small table lamp. The shot changes to look at Jonathan from the doctor's point of view and suddenly Jonathan's hands are very brightly lit like from a spotlight. No one changed or turned on any other lights between shots.
Continuity mistake: Pete arrives when Lana was interviewing Clark for a video that she would send to Whitney. Lana then asks Pete: 'want to give it a shot?' We then see Lana holding the view finder of the camera with her left thumb and index finger while the rest of her fingers in outstretched. Cut to a different angle (as we see Pete) but now the rest of her fingers are no longer outstretched.
Continuity mistake: After Clark gets his powers back the cut on his cheek heals and leaves only blood on his cheek. While still at the power generator he goes to wipe this blood off of his face with the back of his hand only in the shot just before you see his hand go to wipe, a second before his hand actually appears on screen, the blood that was on his cheek is now gone as if it was already cleaned.
Continuity mistake: As the telephone pole crashes falls on Perry's car the sky is bright blue with very widely spread clouds. Clark takes less than two seconds to get Perry out of the car and as he runs away from the car, with Perry in his arms, the sky now has many more clouds than before.
Continuity mistake: Victor is up in Clark's barn loft using his laptop to read an article about his 'death'. In some scenes the laptop is turned toward Victor, while in one scene, as he says he expected to see angels when he woke up, the laptop is now turned at an angle so that the camera can be seen on the screen.
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: As Harry goes into the pond the second time the pylons are connected now with yellow crime scene tape when the camera is out over the water looking at Harry on the walkway. As the camera is in the water, watching Harry fall in, the pylons are gone, even though they should be in the shot, and are connected by a wire instead of crime scene tape.