Factual error: There is a snow pattern on the Quicktime player after Chloe's message to Clark finishes. She would have recorded in on a camcorder, so there wouldn't be any snow pattern, it would be a blue or black screen. The only way there could have been is if she recorded it, put it on VHS, then copied it back onto a DV tape, then transferred it back onto her computer, but there's no reason for her to do this.

Revealing: Kristin Kreuk's body double in the shower scene is noticeable. She is slightly larger and differently shaped.

Plot hole: When Lex gets onto the plane at the beginning, the doctor performs a procedure on him that she says will purify his blood (due to him drinking the poisoned brandy at the end of series 3). She states that Lex needs to do this procedure every 72 hours to stay alive, yet after this, it is never mentioned again. Surely if Lex had been cured (or even if he hadn't) it would be explained what will happen to him.

Continuity: When Jason starts knocking on Lana's door, the clasp from the door chain is all the way to the left. The camera cuts to Lana in bed. When it cuts back to the door, the clasp is now all the way to the right.

Continuity: When Kal-El/Clark pushes Martha away her hands are down around her chest. The shot changes, as Kal-El builds up power to fly, and now Martha's hands are spread out away from her body.

Continuity: 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: When Clark drops the photo of Jonathon, the frame breaks and the photo can be seen separate from it and face-down. When Martha finds it later on, the frame is still intact and the photo is perfectly positioned face-up inside it.