Continuity: When they first arrive on Teyla's planet, the DHD is close to the gate. When the wraith attack, the DHD is much further from the gate.

Continuity: Right at the end, after the entity has gone through the gate, we get an overhead shot of McKay lying on the ground in front of the gate. His legs are stretched out straight. In the next shot, one of his legs is bent. He's unconscious, so he shouldn't have moved.

Continuity: In the scene where the Wraith attack on the Mainland, Sheppard is stunned and falls with his right hand on his gun near his hip, but when McKay and the other guy grab him, to pull him to the gate, both the gun and his right arm are above his head.

Factual error: When Dr. Weir is distracting the scientist by talking about World of Warcraft, he says that he has a level 75 character. The maximum character level is 60 at the moment, and 70 with the forthcoming expansion pack. Not a character mistake, as he clearly knows enough about the game. Submitted by pross79