This episode (and Lost City: Part 2 (2004)) were adapted from the script for the proposed but unmade feature film Stargate 2.
When Jack O'Neill says "Now, if you'll excuse me, my favorite television show starts in half an hour." he refers not to The Simpsons (1989) this time but (of course) to Stargate SG-1 (1997) since the original broadcasting of this episode on Sci-Fi-Channel 12-Mar-04 9 pm was followed by the rerun of the 2nd episode of season 7".
When this two-parter originally aired, each episode had individual different on-screen guest and end credits. The DVD-version of Lost City Parts 1 & 2, however, is merged into one 90-minute episode, with combined on-screen credits for both parts. When these episodes are syndicated today as separate episodes, sometimes the combined on-screen guest credit run, thus crediting several actors for part 1, that are only present in part 2. The IMDb credits reflect the original separate credits.