When Teal'c and Vashin are in the firefight at the DHD, Teal'c is in a frontal shot and the staff weapon is shown closed, yet firing bolts. One shot later, from behind Teal'c, the weapon is opened as usual.
The sign for Auburn, Kansas says that it is the home of the George Washington Generals. The only high school in Auburn is Washburn Rural High School and their mascot is the Jr. Blues. (So named because the school started on the Washburn University campus and their colors were blue and white, like the university.)
The class reunion takes place in Auburn, Kansas, in Shawnee County. This is located in the northeast corner of Kansas. There are no mountains visible from this area; yet there are mountains in the background of the first scene there.