Factual error: In the beginning, Leonard looks at a copy of John G/Teddy's driver's license. The expiration date is listed as 2-29-01, but of course, 2001 was not a leap year, so there would've only been 28 days in the month. (00:12:45)
Factual error: On the upper right corner of the notes Leonard took about the police report, he wrote down the phone number of a detective (Brian Mezear?). It has 8 digits, intead of the 7 or 10 it should have. (00:57:10)