Continuity mistake: Carter and Cadet Haley enter the Stargate and we see them through the "puddle." When they come out on The Other Side, their positions are reversed.
Beware the Third Wish - S1-E31
Continuity mistake: The Wicked Wisher throws giant exploding coins onto the field TJ is on, as TJ runs towards the WW. The giant coins remain on the field after they explode, yet when TJ reaches the top of the field, there is no sign of the coins, or their remains.
Continuity mistake: While Stanley is at his post as a guard, a woman comes onto his screen requesting clearance for a prisoner transport dock. Stanley puts his hand up onto his mouth thinking, but when the camera cuts to an angle showing the front of him, his arms are both suddenly down at his side. (00:11:55)