Revealing mistake: When the bridge is exploding from the mine attack, the stuntman playing Jason obviously launches himself out of the captain's chair.
Revealing mistake: When Saris is torturing the Thermian commander, he stops and approaches Commander Taggart; while Saris is talking to Taggart you can see the lips and teeth of actor Robin Sachs behind the mask.
Revealing mistake: When General Roth is threatening Jason with his claws wrapped around Jason's throat, the very moment he tilts his chin back, you can see the actor's open mouth and teeth visible inside, though he's supposed to be an alien enemy.
Chosen answer: He thinks that the Captain was just tricking Sarris and the "documents" were real.
J I Cohen