Factual error: The cops try to get in the building by cutting some metal part of the door, it might be the lock. All they have to do is break the glass. SWAT teams aren't going to worry about a bit of property damage with hostages' lives on the line.
Factual error: The Ghost of Christmas Past takes Frank to the year 1969, where he watches his younger self giving Claire a set of twelve Ginsu knives on Christmas Eve. Young Frank even remarks that the Ginsu knives are sharp enough to cut through a tin can as easily as a tomato. Problem is, Ginsu knives didn't arrive on the market until 1978, which is when the tin-can-cutting demonstration was first used.
Suggested correction: Also, if you take the date 1955, being 4 years old, so born 1951, then it says, "Take me to his office," putting it in 1968, making him 17 years old, working for a firm, but Bill Murray is playing a 17-year-old.