John Sheppard starts with the P90 triple rail then it becomes a P90 red dot and then back to the P90 triple rail. This happens a few times.
However, the triple rail is a mounting system, to which the red dot sight can be attached. Sheppard could have removed the sights at times, because they protrude quite a bit and make the weapon less compact.
The Atlantis team has found soldiers who have been killed, and they are carrying the bodies back to the Stargate on stretchers. Just after Dr. Rodney McKay asks to stop and complains of sciatica, the dead soldier on the stretcher behind him moves his thumb.
At 12 minutes, McKay says that they wouldn't be able to talk to Atlantis if they dialed the planet. However, earlier they mentioned that the MALP had successfully sent back data and that contact with Leonard's team had been possible but sporadic. All they had to do was wait near the gate for Atlantis to dial them.