Factual error: At the end of the episode, Tom is at a crossroads, theoretically in Iowa. However, the desert/scrub/mountain surroundings are scenery not found anywhere in Iowa.
Factual error: Tom's mother lives in Iowa, but the flowers/plants in her garden include types that could only live in places with warm/temperate weather all year round, which is decidedly not the case for Iowa.
Factual error: When Tom is locked up in an institution for the mentally ill, he is given a bed on a mixed gender ward/wing (both men and women). Wings and wards in mental institutions have not been mixed gender for more than 100 years - it is inconceivable that this practice would be existing in the 1990s in a large city in the USA.
Factual error: A number of the soldiers on the US Army base have haircuts/hairstyles completely against army rules and regulations. This is particularly noticeable given the show is set in the late 90s, when the US Army was much stricter about haircut rules for serving military members. In real life, they wouldn't be allowed to have those hairstyles.
Paradise on Your Doorstep - S1-E5
Factual error: The plane Tom hijacks is a Grumman Goose. This has a maximum altitude of around 20,000 ft. When the pilot flips the pressurisation switch, the instrument panel shows the plane is only at 2500 feet! The cabin wouldn't have depressurised at such a low altitude - and even had it done so if the plane had been flying much higher, it wouldn't have had such a severe and debilitating effect so quickly on Tom as suggested in the episode - he passes out in about 3 seconds.
Stay Tuned - S1-E17
Factual error: The episode is set in New York State, but at the end the road signs are all for Oregon locations.
Factual error: Enlisted soldiers are shown saluting each other, as well as addressing a sergeant as "sir." Enlisted personnel in real life never salute each other, nor are NCOs (like sergeants) ever addressed as "sir."
Factual error: Tom finds a notecard with an "internet access code" that is an IP address: 271.287.291.31. The problem with this is that IP addresses cannot go above 255 as the starting three digits - it's a completely invalid address.