When Wonka comes out to the front gate there is a quick shot on the left of a cameraman filming Wonka with a 35mm camera, just like the type used to film the movie. He is focused on filming Wonka from the outside, but when the camera angle quickly changes to inside-looking out of the fence the cameraman simply vanishes. You can tell that the close ups of Wonka he shot are used in the movie just by the angle.