Other mistake: When the gate is activated (after O'Neill tells Woosley about the order to nuke the city), a member of the Atlantis team is on the bottom right, even though the Replicators have control of the city and no one from the Atlantis team is in the control room. This is because it's a reused establishing shot used throughout the series, including the series finale when the gate is activated (after Harriman says the Earth Stargate is offline).
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Stargate: Atlantis (2004)
1 other mistake in The Return, Part 2 - chronological order
Starring: Jason Momoa, David Hewlett, Joe Flanigan, Rachel Luttrell
Factual error: Anytime a character fires a missile at an airborne target, it's invariably from an M136 antitank launcher. The M136 is designed to hit relatively slow moving ground vehicles and is useless against fast moving airborne targets. (This is because used M136 tubes can't be reloaded and are very cheap to use as props).
Dr. Rodney McKay: Did I mention that I know almost everything about almost everything?
Trivia: In the final episode, 'Enemy at the gates' Sam Carter says that the new ship is to be named the General George Hammond in memory of the character Hammond who had died of a heart attack. This is a tribute to Don S. Davies, who played Hammond, who sadly died of a heart attack in June 2008, shortly after filming Stargate Continium.
Question: Why can't they use every last iota of energy they've got and dial earth and ask them to send them any ZPM's that they could find?
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Answer: Because even all 4 Naquadah generators (one was destroyed) together is only enough to dial Earth for approximately 1.2 seconds (As seen in the episode "Letter from Pegasus"). Further, if Earth had found a ZPM, they would dial Atlantis and let them know. After all, the SGC has no other use for a ZPM than to dial Atlantis.
Grumpy Scot