The Prestige (2006)
Crew or equipment visible
Incorrectly regarded as goofs
Previously, it is shown that the cloned items always appear elsewhere, while the original item remains in the machine. Tesla's experiments with the top hat and the cat, along with Angier's own experiment with himself, all end with the cloned item appearing outside the machine.
While it is logical to assume the clone always appears elsewhere, Tesla clearly doesn't know himself which is the original and which the clone when referring to the hats. It could be that the clone is created in the machine, with the original being transported elsewhere.