Factual error: In the opening credits for episode 5-1: "Arrival," Kristin Kreuk's first name was misspelled as "Kristen." The credits sequence, which was new for Season 5, was corrected by the time the second episode of the season aired.

Factual error: Jor-El tells Clark that he has to return to the Fortress by sundown or face the consequences. Later, Lex tells Chloe that they're in the Yukon, implying that the Fortress of Solitude is in the Arctic. Since the events of this episode take place in the summer, Clark should have had plenty of time to help out in Smallville - the Arctic enjoys permanent daylight during the summer.

Continuity: The blood on Lana's face is different then how it was in the previous episode. While at the crater in Commencement she has two distinct lines of blood on her face. One on her left cheek is thick and the one on the right cheek goes down past her lips. While at the crater in this episode the left line is then while the right line is shorter. These two scenes should be identical since Arrival picks up right after Commencement.