Other mistake: When O'Neill first goes to visit Teal'c in his cell the symbol of Apophis on Teal'c's head is upside down.
Continuity mistake: As the current host for His Shadow is dying, the Clerics are rushing him towards the temple structure for the Divine Predecessors and towards the foremost column to perform the transference operation. In the shot showing all the columns as they rush towards it, the bottom of the closest one is normal like the rest. When the camera cuts to a side angle as the Clerics reach the base, there are suddenly doors and curtains there with three other Clerics standing at the ready. (00:14:20)