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 #1.2 - S1-E2
Factual error: The episode is set in 1977 and Edmund tells Ford that Frances Farmer had a lobotomy. However, the first report of Farmer having a lobotomy came from the 1978 novel "Shadowland" by William Arnold. It was subsequently revealed that some of the events were completely made up by Arnold, including the fact she had a lobotomy. There was never any allegation or suggestion that Farmer had a lobotomy while hospitalized in the 40's.