Revealing mistake: In the scene where O'Neil is fighting Ra's bodyguard, the bodyguard uses claws and hits O'Neil's back, tearing his shirt and wounding him. But you can see Kurt's "wounds" and torn shirt right before he's hit by the bodyguard (a scene after Ra's bodyguard's claws are shown).
Continuity mistake: There is no necklace on Catherine's neck when she greets Jackson in the room with the cover stones (00:13:39). After they have shaken their hands, the necklace appears on her neck suddenly. Then it disappears again. Also, after Catherine has given the necklace to Jackson for bringing him luck before his departure, the necklace appears on her neck again when she is in the control room during their departure.
Continuity mistake: After the slave boy gets a cigarette from O'Neill, he reaches out to touch a gun, and O'Neill grabs it and scares the kid away. O'Neill is then holding the gun with the barrel pointing towards the door, but as the angle changes he is suddenly holding it at a different angle, pointing down to his right and away from the door.
Factual error: Dr. Jackson states that you need six points in a 3D volume to define a unique position. He then draws six points on the faces of a cube and connects the opposed pairs of points with lines, demonstrating that they all intersect to reveal the unique location. Whether this is really a good way to identify points in space is debatable, but even so, the technique he demonstrated requires only four points, not six. Any two lines that intersect do so at a unique point.
Continuity mistake: The bomb's countdown starts faster than a second between numbers change, then eventually gets to about 1 second/change, then goes faster, etc. Its speed keeps changing from shot to shot. Also, the numbers are inconsistent and don't match the time passed between shots of the same scene (i.e. one second later, the countdown can be 5 numbers down).
Factual error: The military ranks for everyone but O'Neil are wrong. O'Neil is a Colonel (Full bird), Kawalsky is wearing the insignia of a Lt Colonel, but is referred to by O'Neil simply as Lt., when he should be called Colonel. All the others are wearing enlisted stripes (Ferretti - TSgt, but is credited as Lieutenant Ferretti), the others are also credited as "Lieutenant", but wearing enlisted stripes.
Plot hole: The gate appears to have about 40 symbols on it, and they already had the first 6 of the 7 needed for the sequence. After dialing the first 6, Catherine said that was as far as they had ever gotten, so we know they had dialed the first 6 before. Except they didn't need Jackson to figure out the riddle since all they had to do was try each of the remaining symbols as the seventh, one by one, until they found the one that worked. So with a maximum of about 40 tries they would have found it a long time ago, all without Jackson's help.
Factual error: When they first power-up the Stargate in the military facility (using Jackson's decryption), the thing surges to life, and electrical sparks spray out of overloaded connections all around the control room. This could only happen if there were no fuses or electrical breakers in the military's control system, which is a ridiculous notion for such advanced military technology. In real life, a powerful overload situation would instantly burn out fuses and trip breakers and the whole system would simply go dead (there would be no sparks). Showers of sparks are a common error in many science fiction and space fantasy films dating back many decades.
Add timeCharles Austin Miller
Revealing mistake: When James Spader is first exiting the pyramid after he first arrives on the planet, he begins to touch the wall on the left as the moves out the doorway. He appears to be using the wall for balance. During the last shot before he walks completely out into the open, the "solid rock" wall bends inward like it's made of rubber.