This occurs when Jonathan first enters Dracula's castle. As he enters, a large shadow of Dracula appears on the wall, and as the shadow grows bigger, it "turns" which clearly exposes the shadow of the prop guy who is 'riding' the cutout. You can see the outline of his studio headphones and you will notice that he shifts his weight, possibly to steer the prop. It's hard to spot if you aren't looking for it, but clear as day now that it's been exposed. Enjoy!