When Robin cuts the motorbike in half (41 mins) it falls to the left, away from the American flag . When Luke finds it shortly after, it's in a different position on the garage floor, lying towards the flag.
In the swimming pool scene, Avery is lit by diffuse skylight as he rests on the edge of the pool. After the last cut to Al, which lasts only a few seconds, Avery is lit by bright sunlight.
Jason steals "oxys" - Oxycontin or Oxycodone - from the pharmacy shelf. Both these drugs are "CII" (Schedule II) controlled substances, the most restrictive classification for legal drugs. Federal law mandates that they be kept under lock and key to prevent easy access by thieves. They would not be kept on the shelf.
As IA is questioning Avery in his shooting of Luke, they try to trap him into admitting he shot first. Police officers do not have to be fired upon to shoot a suspect. They are legally justified in firing on a suspect if themselves or others are in immediate danger, IE having a gun pointed at them.
On the last car chase, the officer who is first on scene describes Gosling as heading south on State Street before he loses visual. Cooper then calls out that Gosling is heading west on Stanford, which really should be east. This is backed up by the fact that Cooper calls out that they're heading north on Plymouth on the next turn which happens to be a left turn. You can only go north on a left turn if your previous direction was east.
While most of the money shown taken in the bank robberies were of the correct design for the time period (the first act was set in 1997), there is a scene in Avery's garage that shows a stack of stolen $20s. The bill on top is a redesigned $20 with the large head portrait, which was not introduced until 1998.
The beginning of the film takes place in the 1990s. The General Electric sign is shown with red and blue lights. During this time, however, white lights were the usual color of the General Electric sign. Since September 11, 2001, the lights have been red and blue for the majority of the year.
When Cross leaves the police station after putting the cash back in the evidence box, he sees the chief standing by the cruiser talking to Deluca. A modern 2011 Hyundai Sonata in Limited trim with Turbo drives in the background. This would not have been available in the time the scene takes place (circa 1990, with the last arc of the film taking place in present day).
The bike features in the first part of the movie is a late model Suzuki DRZ400E with larger headlight, first came to the market in 2001.
The sound of the Honda XR motorcycle varies from 2-stroke to 4-stroke and from single cylinder to 4 cylinder throughout the film.
Avery uses his single crutch on his right side with the injured leg. Physical therapy requires a single crutch to be used on the unaffected side, in this case his left side.
Both the sons are meant to be 16 and while clean shaven it's obvious they have far more stubble than any 16 year old ever had.