I just watched Lost City on DVD, and I notice something. When Carter informs Mitchell that a ship is inbound, that couldn't have possibly happened. Because SG-1 goes to the Cargo ships rings after Prometheus contacts them. The only other way this could have happen is during the gap between the beginning of the battle and Prometheus's arrival. Which looks like a very small gap of time.
Here's something else (that has nothing to do with the post): I learned from the audio commentary from Lost City, that the beginning of the Episode (or movie, I forget) was 30 million years ago when Atlantis took off from Earth. I Wonder if this cut scene was used for the first Scene of Rising.