The Mask of Doom: Part 3 - S1-E10
Continuity mistake: When the heroes fall asleep next to the Coffin of Argos, Thing is at the top of it, and Johnny's head is positioned midway with his feet nearly level with the top. When the Persians begin approaching them, the top of the coffin has now flipped to the opposite side, with Johnny's head resting near it, and Thing's head in line with the middle. The coffin also went from resting on the ground to being on top of a pile of treasure. (00:12:29 - 00:12:50)