Plot hole: When Edge needs the vial of Clark's blood back, Edge holds Clark's parents hostage. Clark decides to use a sharp piece of kryptonite rock to cut his skin and give Edge a new sample. When Clark picks it up, and when he places the kryptonite rock on his skin, he shows no sign of the usual effects of the rock which include the green lines radiating up his arms.
Continuity mistake: As Morgan Edge hands Lionel the bag with the mason jar of blood the camera is on Lionel's side and bag has a very neatly folded flap to keep the top closed. As Lionel takes the bag, while the camera is on Edge's side, the opening is wrinkled and not folded shut as it was before.