During the battle in the entrance of the Pyramid, Teal'c is seen shooting an M246 light machine gun. When O'Neill calls out for him, he is suddenly holding an M4A1 assault rifle.
While Anubis is battling many System Lords in their mother ships, Jonas Quinn says, "Sounds like a heck of a battle going on up there." If sound waves -could- be heard in space they would not be heard by someone as far away as the surface of the planet.
In the last scene, after Skaara has removed the village, the tracks of a modern wheeled vehicle are clearly visible.
Her'ak tells Anubis that a "human base is on the planet", but the Goa'uld call the humans of Earth (and sometimes all humans in general) the "Tau'ri", not "humans".