Factual error: When Bradley Cooper calls Louis C.K. he asks him, "Where are you?" Given he's just called him on his office number, rather than a carphone, he knows exactly where he is.
Factual error: In the scene where Irving goes to one of his dry cleaning locations and retrieves a gun and some money out of his safe, the money seen is quite obviously a more recent looking print with the spacing and look of a "large faced" bill, as opposed to money from that era with small faces on the bills.
Factual error: In the scene at the airport when the jet arrives, a Diamond Da-40 is seen in the background. This aircraft was not made until the early 90's, a decade after the scene takes place.
Factual error: They mention that the mayor adopted one of his children from the Boys and Girls of America, but the organization was only known as the Boys Club of America until they changed their name in 1990.
Factual error: In the opening scene, Christian Bale is arranging his comb-over. On a nearby table, a can of present day Elle-Net hair spray can be seen.
Factual error: The scene at Teterboro Airport shows a tri-jet Dassault business jet. The first version of that plane was the Falcon 50, which wasn't certified until 1979. The movie takes place in 1978.
Answer: Modern tempered glass was developed and patented in the early 1900s and was in general use by the 1940s. It would have been routinely used by businesses at the time Irving was breaking out store windows when he was a boy.
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