When Ishta and Teal'c escape from the tent as it is being shot to pieces, the sky is overcast, but, as they spy on the heavily guarded gate to escape back to Earth, the sky is clear.
When Ishta falls out of the captive Jaffa's grasp, he cuts her throat slightly and blood is visible. It disappears in the next shot and is not bandaged or mentioned for the rest of the episode.
When Teal'c rescues Ishta, the Jaffa holding her says that "zatting him even once would kill her." Using the word "zat" as a verb is a human construct and something no Jaffa would say.
When Carter pushes the red button to launch the missiles through the stargate, the panel the button is located on has the wording "Print Master 710F". This is an HP printer controller, and pressing the button would send printing commands to an attached printer, but not launch a missile.
We see a horse emerge through the Stargate and it's ridden down the steel grid ramp. The audio has the sound of the horse's hoofs on the steel grid but the ramp has been covered with a non-slip material for safety. The ramp is uncovered as usual later on, then it's covered again. This time there's no sound of steel under anyone's boots.