Factual error: We're told they carbon dated the gold to determine its age. Problem is, the gold hasn't aged by the normal processs - as it's been brought forward in time it will appear to be extremely new. As such carbon dating wouldn't work. Also, carbon dating only works on things that were alive and absorbed carbon-14; gold, having never been alive, could not be dated this way.
Factual error: As Walker and Atwood are falling from the building in 1929 New York City, the reflection of Vancouver's Harbor Centre is visible in windows. Furthermore, the Harbor Centre was completed in 1977, so this is a double goof. (00:22:45)
Factual error: In 1929 New York, the license plates on the cars are wrong. In 1929 they used an A1-234 pattern and these are 123-456 patterns. 1921 used the 123-456 pattern, but they were white on black plates, not the black on yellow we see.
Answer: Also, it was strongly implied that Lyle Atwood was in New York City shortly after the massive Wall Street crash that occurred in October of 1929, so all he would need to do is find stocks that still exist and are doing well in 2004 and buy those particular stocks when they're presumably at their lowest value in history; the payoff after 75 years would be astronomical for the stockholder.
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