Throughout the movie, cars have Washington State license plates. At 1:17:32, the helicopter registration on the fuselage starts with a "C", indicating that it is registered in Canada. This either indicates the helicopter traveled internationally or it is a Goof item (the movie was filmed in Canada).
Multiple cast members have appeared in the Stargate franchise. Stargate SG-1 (1997): Michael Adamthwaite - five episodes as Her'ak; Garry Chalk - 10 episodes as Colonel Chekov; William B. Davis - two episodes as Ori Prior Damaris; Ty Olsson - two episodes as Colonel Barnes and Jaffa #1 (one episode each). Stargate: Atlantis (2004): Pascale Hutton - one episode as First Officer Trebal; Shaw Madson - one episode as Sergeant Matthews.