In the scene where Andy and Gina are discussing whether they should leave for Rio, she mentions that there are no extradition treaties between Brazil and the United States. This is not true, although her comment was actually more a jab at her husband than actual knowledge.
When Andy is wrestling Justin for the gun, he has Justin pinned to the ground with his body and their hands fight for the gun. When Hank rushes over to help, only two second later, he is shown pulling Justin off of Andy.
When Charles phones the police department looking for Detective Barrett to check up on his wife's case, the phone is answered by the greeting "22nd Precinct". The 22nd Precinct is the NYPD Central Park Precinct in Manhattan. Follow-up on a case out of Westchester, where the crime took place, would either be a Brooklyn precinct since we learned that Bobby LaSorda was from Red Hook, Brooklyn or with the Midtown North Precinct (also known as the 18th), the home of NYC's diamond district, the most likely known destination for the would-be stolen loot within local NY law enforcement. There would be no reason to phone the Central Park Precinct.
When Andy is shown being injected with heroin, the film shows Justin first withdrawing blood into the small syringe, to "confirm that he is in a vein", with the rubber tube tourniquet applied, above the level of the needle. However, when he subsequently injects the drug, he does not first remove the tourniquet, which would be normal practice when administering intravenous medication.
There is a repeat of the scene showing Andy answering Hank's pay phone call after the robbery. In one, the receptionist says "...sounds like some kind of nut case" and Andy says "Yeah, I'll take it". In the repeat, the receptionist says "Sounds like a nut case" and Andy says "I got it." However, this is to show the scene from different "viewpoints."
The goof items below may give away important plot points.
When Andy is in the hospital at the end of the movie, his EKG is hooked up incorrectly; there are only three electrodes on his chest instead of six, and they're not in the right spots. Although a three-lead heart monitor could be used, Andy would more likely be on a six-lead monitor, with the electrodes further apart. Also, since he had also been a shooter and has a police presence in the hospital, he'd be handcuffed to his hospital bed.