Revealing: When Jack and Teal'c are first shown in the fighter when it first enters space, if you pay attention to the stars in the background, they tend to move in a rather jerking fashion.

Revealing: When Teal'c and O'Neill are passing by Juipter (after the failed missile burn), you can see a reflection in the background window of the cockpit. But the reflection is not the backside of their helmets, but instead is the front sides matted on to give the minor illusion of a reflection.