Factual error: The briefcase containing $1 million was full of $100 bill straps, two columns by six straps or $120k per layer. Eight layers would have been 4 inches tall, not including the four straps left over. The top and bottom portions of the case were equal depth and only the bottom half was full. The case would have had to be approximately 8 inches deep, which it evidently was not, to hold $1 million.
Factual error: Jenny would not have received a letter telling her she had been successful in applying to Oxford University as shown at the end of the film. As an undergraduate she would have received a letter from one of the Oxford colleges to which she had applied informing her she had been accepted to that college.
Factual error: There is a poster of Shaun Cassidy hanging on Susie's bedroom door - not only was Sean Cassidy only 15 years old at the time, but he hadn't even had a hit single yet.
Suggested correction: If you're talking about the poster visible at the 16-minute mark, I'm pretty sure that is Shaun's half-brother David Cassidy who was at the height of his popularity in 1973.
It's definitely David Cassidy.
Factual error: When the Lincoln Continental Convertible was rolling backwards down the hill, Nick put his hands on the trunk to try to stop it. A car, especially one weighing 5,000 - 6,000 #, would easily knock over a person and possibly cause serious bodily injury (even death). Nick's attempt to stop the car by holding onto the driver's door handle would also be futile and potentially dangerous. (00:37:47)
Factual error: About 30 minutes from the end, the rodeo parking lot is shown, with the cars parked 3 deep (i.e., 3 cars parked nose-to-tail). Valet parking? At a Wyoming rodeo?
Factual error: In the dinner scene with Helen Mirren and James MacAvoy, she was playing a gramophone recording of "Un Bel Di" from 'Madame Butterfly,' and the year was 1910. The opera was not recorded until much later.
Factual error: The part of the movie where they have had the morning updates at the police station, Richard Gere later walks on the sidewalk and stares deliberately at a pair of Muslims praying. The sun is shining on the backs of the Muslims heads indicating that they are facing west even though Mecca would be off to a much more easterly direction from Brooklyn.
Factual error: At 01:29:08 we see Carys lying despondent on the couch in her living room surrounded by balled up tissues, empty food containers/soda cans and trash - all the signs of going through a bad break up. She gets up to answer the door for her mom, who has brought by a plate of cookies. Carys sits on the couch again, looks down, looks up, and by 1:29:40 the entire room is clean; we see her mom fluffing a pillow. There is no way her mom could have cleaned the living room in less than 32 seconds.
Factual error: When Esposito revisits the murder scene, he asks Morales whether he would prefer the culprit to receive the death penalty. Morales answers that he would not, claiming that to doze off and fall asleep (hinting at execution by lethal injection) would be too good for the man who raped and brutally murdered his wife. Execution by injection has never been practiced in Argentina - where the last execution was carried out in 1916, by shooting - and was legally enacted only in 1977 and practiced the first time in 1982 (in both cases by the state of Texas). Thus, it seems anachronistic that anyone would equate the method with capital punishment in 1974, when the scene is set. (00:24:00)