When the FBI return all of the confiscated items to Richard mothers apartment the FBI agents enter through the front door and then appear to disappear through the apartment and stand in the corner of the kitchen just out of view of the camera. The adjoining apartments front door is opposite Richards apartment and would mirror his apartment so there would be no exit through the kitchen.
The 'Atlanta Division' of the FBI is in reality the Atlanta Field Office.
As a campus security guard, Jewell would not have been allowed to wear police patches on his uniform.
The Atlanta police uniforms would have the word 'police' on the backs of their uniforms.
It seems odd that a police officer would tend to a suspicious package, rather than evacuate the area and then await a bomb disposal team.
After the pipe bombs explode, a police officer on his radio says "We have several people down." There are many down,not 'several.' There's a chance he chose his words under duress, but a law enforcement officer would be able to better communicate the emergency needs demanded by the circumstances.
When Jewell calls Bryant, he gives his phone number as (404) 194-8188. While 404 is the Atlanta area code, no phone number in North America begins with a 194 exchange. This is meant to indicate a fictional phone number, similar to the "555" phone numbers commonly seen in movies and TV shows.
The computer monitors in the newsroom, while made out to look like 1990s CRT screens, are mock-ups, since they have flat screens without the curvature real CRTs have.
The dartboard is hung too high to be used properly or practically.
Before the bomb goes off, during the Macarena dance, one of the dancers performing on the stage is wearing an Apple Watch.
Outside Jewell's apartment early on, there is a post-1998 Mercury Grand Marquis parked in one of the spaces.
When the children are running around the Olympic rings fountain, the College Football Hall of Fame is visible in the background. It opened in 2014.
At several points, the local newspaper in Atlanta is referred to as the "AJC." But in 1996, the "AJC" didn't yet exist: the Atlanta Journal and Atlanta Constitution didn't merge until 2001.
Georgia "peach" license plates are shown with seven characters. In 1996, there would have only been license plates with six characters: three letters and three numbers.
The arcade early in the film features three Galaga machines. Sounds effects are heard from Galaga in the arcade long before anyone starts playing one of the machines.
About 43 minutes in Richard Jewell, in his bedroom, is on the phone speaking to attorney Watson Bryant regarding Bryant's assistance and possible representation on a book deal. A reflected circle of light from the filming crew passes over the chest, right arm of Paul Walter Hauser and then appears behind him on the wall over the headboard before exiting in the upper left hand corner of the shot.
During the press conference towards the end of the film, Watson Bryant refers to Bobi as the 113th victim of the Olympic Centennial Park bombing. In actuality 2 people were killed and 111 people were injured in the bombing making her (if anything) the 114th victim.