Factual error: Cars in Thailand drive on the left side of the road with the steering wheel on the right, unlike the ones shown in the episode.
Chapter Seventy-Nine: Graduation - S5-E3
Factual error: Archie revealed that he joined the Army to avoid repeating his senior year and was shipping to Basic Combat Training the following morning. Before leaving he would need to wait for his background and medical checks to be completed (including getting his dropped murder charge reviewed for suitability), which could take weeks. Also, the Army usually requires a diploma or GED to ship to basic. There were brief periods when the Army was accepting dropouts but it was not when this episode took place.
Factual error: Hap is sending a package to Houston, Texas but the zip code he writes is "89921." This isn't anywhere near Houston. At best it's El Paso, although 89921 isn't in use. (And if his 5s look like 8s, "59921" is in Montana).
Factual error: Although he is openly an SD officer, Huth does not wear the SD insignia on his cuff.
Factual error: When they're traveling to the farm to rescue her friend, (when a drone is filming from above following the truck down the road) there is light snow on the ground. Throughout the series in different parts, when they speak they're blowing mist/fog from it being cold. It isn't cold, snowing or any fall leaves in Mexico. Nor do those things hardly ever occur in southern Texas either.
Katie Girls - S3-E3
Factual error: Randall flies out last minute across the country to Los Angeles to be at his sister's side for her surgery. The scene where he arrives at the hospital and meets up with her husband Toby in The Waiting Room is prefaced by an exterior shot of the supposed hospital building. The sign outside the hospital indicates the name as "Sutter Health Alta Bates Summit Medical Center," which is a hospital in Berkeley - the San Francisco Bay Area - about 400 miles north of Los Angeles. (00:19:30)
Factual error: You can see the Unicredit Tower on the Milan skyline - the episode should be set in 1997 but the unicredit tower was built in 2012. (00:31:00)
Factual error: The story is set in the 1850s, but when Greshambury Manor is shown at night, it is obvious that the front of the building is illuminated by electric lights.
Factual error: The Metropolitan Police isn't a national police force (except for close protection and anti-terrorist matters). It has no authority over other police forces. It doesn't take over criminal cases from other police forces. It hasn't even provided investigation teams on request for decades. Every force handles its own investigations. A Met chief superintendent and his team coming in, as depicted here, and taking over an Avon and Somerset investigation just wouldn't happen.