The REAL reason his accent changes during the film.
A friend of mine has a film internship in LA and worked on the film. He said a "reputable source" claimed that Nic Cage contracted lockjaw after accidentally cutting himself with the rusty spoon used in the film. Cage refused a tetnus shot, and subsequently came down with the voice-inhibiting condition. He received treatment for the lockjaw at a local clinic and his voice quickly returned to normal. This accounts for the sudden arrival and departure of his drunken-Jimmy Stewart voice that permeates the middle third of the film.
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