Jack says that the Stargate has "39 little pictures all nicely engraved on it." However, the symbols on the Stargate are raised from its surface, making them embossed, not engraved.
At the end of the episode, when the Stargate is activated in the crate (at the landing strip), the hole made by the vortex is wider than the Stargate itself, but the vortex only stretches out as wide as the inside ring of the Gate.
Before going to Utah to retrieve the second Stargate, Hammond tells SG-1 not to fire under any circumstances. However, he doesn't mention using the Zats to stun, even though SG-1 ultimately end up carrying them. Had they used the Zats and stunned at least the first three NID agents they found, they wouldn't have been able to escape.
Teal'c says that SG-2's point of origin was "galaxies away from Madrona." However, they don't have a ZPM to travel beyond their own galaxy or power the eighth Gate symbol.
Hammond: Do we have any ideas what makes it tick?
Jack: That's why we'd like to go back, sir. Carter wants to get a closer look with her specialized... doohickeys.
Jack: I believe that's the technical term, sir.
Hammond: (while trying to figure out the second gate's position) We're transporting our people across the galaxy to find something we lost in our own back yard! Incredible!
Hammond: (trying to get in touch with the President) No. I need to talk to him now... son, do you know what color this phone is?
Jack: Oh sure--we'll just call out an APB for a huge two-story metal ring with 39 little pictures all nicely engraved on it.
Jack: Hold it! All right...we came here in peace, we expect to go in one... piece.
Maybourne: Teal'c. It's good to see you well.
Teal'c: In my culture I would be well within my rights to dismember you.
Matthew Walker (Roham) would go on to play Moros/Myrrdin/Merlin in Seasons 9 and 10, as well as appearing in Stargate Atlantis.
Michael Shanks and Vaitiare Bandera's daughter, Tatiana, was born during the filming of this episode.
This episode marks the first appearance of Major/Colonel Reynolds (Eric Breker) on the series.
Syndication air date: January 17, 2000.
Jack: But whoever these dark side guys are, they can do some pretty nasty damage if they figure out how to work this thing.
This is a reference to the Dark Side Force from the Star Wars universe, which is the object of power for the Sith order. Since then, it has become a colloquialism for someone who has chosen the path of evil.