Visible crew/equipment: Near the end of the episode, when the team, Baal and Adria are solving the puzzles in the cave. As the camera is focused on Sam and Mitchell, just to the left of the screen the camera crew can be seen, with sports trainers visible and camera equipment.
Continuity mistake: During the scene where Jack is talking to Daniel aboard the Odyssey, there is only 1 star on each of his shirt collars, indicating that he is a Brigadier General, instead of the proper two stars for a Major General, as he does in every other scene of the episode.
Character mistake: At the end, Vala and Mitchell establish a wormhole and let Teal'c and Jackson know. Almost a minute passes before Teal'c and Jackson get back to the gate and Jackson yells "run" because they need to get through the gate right away. Obviously they're detained, but after being let go, Mitchell says they're sending the iris code now. This is something that should have been done sooner, especially after hearing gunfire, so they could be ready to go through when Teal'c and Jackson arrived.
Plot hole: And the end, when Vala and Mitchell activate the Stargate home, SG-1 is delayed in being able to step through because they are detained. However, the whole time they're detained by the gate, there's no radio transmission from SGC. Later we find out they're coming home early, so on SGC's side, they just had an unscheduled off world activation and would know it's from the planet SG-1 is on, and they would radio for an update. None of that was done so the conversation could happen.