A crewmember wearing modern-day clothing can briefly be seen behind Leda when she and Daniel are talking outside in the garden, a few scenes before Soren's troops arrive
Daniel: We have to help them. You know that.
Jack: Regular contact, no exceptions. The second things get a little squirrelly... (motions getting out)
Daniel: Thank you. (Daniel walks away)
Jack: Daniel, squirrelly.
Soren: It is obvious you revere the Great Ring as much as we do, General O'Neill.
Jack: Oh yeah, we love the old gal. Quite possibly for different reasons than you.
Jack: That's terrible... and yet, not our problem.
The handgun the soldiers are using are the same one the Genii use in Stargate Atlantis.
Around the conference table in the bunker are Herman-Miller Aeron chairs; like the 20th century weapons these are from Earth as well.
Both the rebels and the Protectorate troops are armed with real 20th century weapons from Earth, such as AK-47s etc. The weapon the rebel leader is holding in the end is a WWII Russian PPSh41 for example.