When Narim uncovers the secret test of the new bomb on the computer system, the footage of the explosion appears to be the same footage used in Chain Reaction (2000).
Around 29:30, Teal'c asks O'Neill to hold his hand. When TV shows and movies show someone "offering their hand" it is almost always by holding it palm-up, but Teal'c offers it palm-down - this might have been intended as a subtle reminder that Teal'c was raised on an alien planet away from Earth customs.
The initial area covered by the Tollans' weapon displayed on Carter's map does not match the 38 that she suggests would cover the entire Earth. The first display is a square. A weapon's firing area is an arc which, on a land-based cannon, would be a circle and not a square.
According to the size of the square for weapon coverage range, the USA doesn't need more than maybe two ion cannons. Of course, protecting the entire planet, not just the USA, is the goal (from the Earth's point of view, anyway) of this deal.
According to the size of the square for weapon coverage range, the USA doesn't need more than maybe two ion cannons. Of course, protecting the entire planet, not just the USA, is the goal (from the Earth's point of view, anyway) of this deal.