Episode #2.8 - S2-E8
Factual error: In the opening seconds of the intro the BTK killer is following a woman home in his work van. Both the woman and BTK have license plates on the front of their vehicles. Kansas does not use front license plates. (Also, BTK's van shows the county abbreviation on the plate as WY - Wyandotte County - where Kansas City, KS is located nearly 200 miles away. The county tag abbreviation should be SG for Sedgwick County).
Episode #2.1 - S2-E1
Factual error: Season 2 is set in 1979. Bill Tench and his wife are leaving the church and going to their car. Behind their car is parked a 1981 Chevrolet Celebrity.
Episode #2.7 - S2-E7
Factual error: While agent Ford is running with the cross, a CNN news truck is in the background. CNN didn't launch until June 1980.
Episode #2.8 - S2-E8
Factual error: Sergeant Stokes says "I can't so much as distribute a post it ." Post-its weren't invented until 1980 and weren't a common place staple at the time the episode was set in. (00:10:15)
Episode #2.9 - S2-E9
Audio problem: The FBI interview Wayne Williams on the bridge and then decide to release him. The sound of the engine starting is heard as Williams is still getting in his car.
Suggested correction: That was Jim's car starting first so it could back up. The second car starting was that of Mr Williams after he was in the car.