Blank Check

Plot hole: To buy the house, Preston would have had to sign some papers in-person, and no realtor would let a young child act as an intermediary (for "Mr. Macintosh") for such a legal procedure.

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Plot hole: It is not money laundering if you give FBI marked bills to the banker and he hands you back the same marked bills. If the banker had handed back unmarked bills, in regards to the check for cash exchange with the kid, then the FBI teller would never have figured out that "Macintosh" was using the marked FBI money. Thus the money would actually have been laundered. The main villain did not actually do any money laundering, only bank robbery.

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