None of the team members appear even slightly fazed by firing a 12 gauge shotgun in a submarine's corridors. A 12 gauge has an extremely loud report. If a person were to fire even a single shot in a tight, confined space such as that without hearing protection it would cause disorientation, painful ringing in the ears and likely permanent damage to the eardrum after firing multiple rounds. The SG team members should therefore have been wearing hearing protection.
When the team visiting the submarine are prepping to depart on the mission, there is a scene with four screens that show Teal'c and O'Neill looking at each other. Their body and heads move but the camera doesn't change angle.
Major Davis tells us that the US Government is denying having anything to do with the missing Russian sub. However, when the team is preparing to board the sub, a Russian Sovremenny-class destroyer is seen next to the submarine.
Thor implies that SG-1 used "Charcoal, sulfur, and potassium nitrate" to destroy replicators, but the modern weapons used by SG-1 all use "smokeless powder," not the old-fashioned type of "black powder" which Thor described.
The General says they need a shower because they stink, yet they are all freshly shaven (as always) and Teal'c has a new face-do.