Factual error: The Indiana plate on the rich guy's car had an incorrect serial number. The "Amber Waves of Grain" plates had the format 1 or 2 numbers (county code), then a letter in small font, followed by more numbers. The plate on his car was all numbers.
Factual error: When Preston is using his computer to calculate how long it would take for $11 to become $1M at 3 .45% interest, the answer was 342,506 years. While it would still take a long time, it would only take about 334 years (assuming he didn't add money and interest was only compounded once a year). After just 1,000 years, he would have almost $6 quadrillion and after 342,506 years, the amount would be nearly $2 followed by 5045 zeros.