Visible crew/equipment: When Vulcan is taking away Baron, look carefully and you'll be able to see a wire in the tail of his coat.
Visible crew/equipment: In the scene after the storm, the ship moves in the sand. Look at its front and you'll be able to see a wire that moves the ship. It's very visible.
Visible crew/equipment: When they're building the petticoat balloon, the camera slowly goes back. Look at the lower-right corner of the screen: there is a man wearing a stadium jacket. He's a crew member.
Continuity mistake: When Munchausen is about to be executed for the second time, right after the Sultain sais: "Executioner, execute!" we see the executioner raising the axe. The axe is facing the wrong way. In the next shot it's the right way.