Revealing mistake: The second level of the temple is an obvious matte painting inserted into the scene.
Continuity mistake: Galen's left hand is above shoulder height and grasping one of the cage's bars as he speaks with Virdon and Burke in the cage. The view of Galen from Burke and Virdon has Galen's hand below his waist.
Revealing mistake: The knife the prisoner is using to fight the guards is obviously rubber.