The Eye (2) - S1-E11
Visible crew/equipment: In the beginning of the show (before the intro starts), when you look out the window you can actually see two people shaking the small trees in the storm... Come to think of it, why would there be trees in the first place? How could they survive out there if Atlantis submerged in the ocean? (00:02:21)
Visible crew/equipment: When Novak is talking with Caldwell on the comms about beaming a nuke inside the ship, you can see an arm in Hermiod's "butt" moving with Hermiod. (00:08:30)
Visible crew/equipment: After taking the enzyme, Mckay is talking to himself as he dials the gate. When he goes to push the centre button, an arm moves on the opposite side of the DHD. (00:09:35)
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