Factual error: For being set in the spring in San Francisco, the trees (look at Maggie coming back home in the intro) are rather barren and there are dead leaves in the grass.
Factual error: The search that cracks the case is nonsense from a simple logical standpoint. There are three people, whose deaths have never been related together, but that all died because of tetryzoline poisoning. Entering all three of those names in google would not produce relevant results or even narrow the spectrum, because it's three unrelated deaths. (01:08:40)
Factual error: In the early scene when they enter the "It's a small world" ride at the '64 World's fair, the monorail in the background runs way too fast. The actual one moved very slowly. Also the monorail would not have been visible from the Pepsi Pavilion.
Factual error: The limo used in Louisiana has a front license plate and it's a Louisiana plate. Louisiana only issues a rear plate.
Factual error: Michael's wife meets with Longo in prison, and she has an iPhone. The trial was in 2003, 4 years before the introduction of the iPhone in 2007.