The SG-1 team team were knocked out, then woke up without ANY of their equipment or weapons. Yet when they immediately go to the Startgate, Carter has the signalling device which identifies them to Stargate Command.
When SG-1 first steps through the Stargate, Colonel Jack O'Neill welcomes everyone to "P3X-989", but in the scene after the opening credits, he calls the planet "PX3-989". This name seems to be correct as later in the episode, Major General George S. Hammond calls the planet "PX3-989"