The orientation of the food on Holden and Tanya's plates changes several times at the diner when the camera angle changes.
Multiple cars are shown with front license plates in Georgia. With the exception of Disabled Veteran plates, Georgia has never used front-mounted license plates.
When agent Holden arrives in the Atlanta airport a sign in the foreground reads "Pardon our appearance during renovations". Later in the episode, GBI agent Garland Periwinkle says that the mayor of Atlanta is "trying to build the world's largest airport". This "world's largest airport" was completed in 1980 and was actually a brand-new facility, not a remodeling of the existing structure.
At the meeting in the church regarding the child found in the basement, a member of the audience refers to the pastor as "Father". Lutheran ministers are called "Pastor" or "Reverend" but not "Father". It is established in the first episode it is a Lutheran church.
The Lutheran church has a cross with a Corpus, but Protestant denominations don't use crosses with a Corpus on it.
When Holden checks into the hotel in Atlanta, the clerk takes him to his room because their key cards have been giving trouble. In this time period, that would still have been an actual metal door key rather than a card.
Chevrolet Malibu driven by Jim Barney in Atlanta has quad headlamps, formal roof shape, rear passenger window with operable vent panel. This denotes a 1982-1983 model.