At the end, the Atlantis Gateroom tech receives an IDC before the "kawoosh" sound, before the wormhole is established, which is impossible due to established rules.
When McKay uses the wormhole to return to Atlantis, he does not have an IDC transmitter to identify himself to Atlantis personnel, nor does he have a radio to use to tell them to lower the shield. If the control room is following standard procedure, he should slam into the shield and die on arrival.
While never explicitly stated, this is part of the locator implant chip discussed a few episodes back. No need to carry around the IDC transmitter anymore.
While never explicitly stated, this is part of the locator implant chip discussed a few episodes back. No need to carry around the IDC transmitter anymore.
When McKay is dialing the gate after beating up the guards, a crew member can be seen behind the DHD.