In the episode "Shades of Grey," Col. O'Neal is forced to retire after he steals technology from a friendly alien species. He asks to retire on a planet where a woman he was involved with lives. This is a front, but that's not important. As he "leaves" Earth for the last time, the SG-1 regulars stand at the bottom of the ramp to bid him farewell.
At the General's order, they give him a salute (very common among the US military). If you look at Doctor Frasier (short brown hair, wearing the skirt) she gives him the British-style salute. With the Brits, the palm is facing out while the US the palm is perpendicular to the ground. They are supposed to be US military, not Brits! It's worth a good laugh!