Corrected entry: When "Desert Camo" SG-1 returns to their dimension through the Stargate, we hear 5 "slurps" indicating someone passing through the gate, however there are only 4 members on the team.
Corrected entry: There is a shot of the team exiting the stargate on the prototype's planet. The gate's event horizon (the watery-looking plane they walk through) has a flat base and the gate's rim (the stone circle) is shown disappearing into the ground, as if the base of the gate is slightly buried. It's been long established that the "wave" that bursts from the gate when it opens vaporizes any matter in its path. Therefore, the part of the ground that is covering the event horizon in this shot should have been vaporized the first time this gate opened, leaving a shallow trench stretching out in front of the gate.
Correction: The "Wave" only protrudes from the center of the gate and not the entire gate, hence no trench on the ground.
Corrected entry: The Ori plans on collapsing a planet to form a black-hole, unfortunately you need a really big sun (several times more massive than our sun) before it will do this, there's no way a planet will naturally form a black-hole.
Correction: Any object of sufficient mass will form a black hole. As you point out it would need to be several times the mass of our sun. Perhaps he planned to put a stargate on the planet and send a super-dense material through.
The key phrase was "naturally form a black-hole." The Ori used technology to super-compress the planet to achieve an unnatural result, so the question of mass is misleading.
Corrected entry: Sgt Walter Harriman shouts "Unauthorized offworld activation" instead of "Unscheduled offworld activation". "Unauthorized" is only for outgoing wormholes, and makes no sense in this context. It is unlikely to be a character mistake as he generally says "unscheduled" two or three times per episode.
Correction: Why could this not be a character mistake? People sometimes say the wrong thing inadvertently, so this actually makes Walter appear for "real" in a sense, so this would not be a production mistake.
Correction: The 5th sound effect could have been the rather large carrying case (contains the cure for the Ori plague) that Janet was given by Sam. Objects have been shown to make that same sound when the hit the event horizon.