Factual error: During the opening credits, Alec Baldwin and Selma Hayek are driving back to New York. They pass by various buildings, one shot being entirely devoted to a dilapidated Blockbuster video store. That shot must have been archive footage from the UK, since you can see the realtor sign by it, and it's from Carter Jonas, a London based firm, and gives an 01962 phone number (Windsor).
Factual error: There are roars of thunder without any visible lightning. Next, two bolts of lightning occur at the same time as the thunder booms (but the thunder continues after the lightning strikes). People see lightning before hearing thunder. (Although the two do happen at approximately the same time, light travels faster than sound which is why people see lightning first). (00:12:45)
Factual error: The protagonist wakes up supposedly at 5 AM of December 2nd in New York City. Outside, the sun is shining, almost two hours too early. (00:00:15)