When Scully returns to the motel after a night spent treating the wounded, Mulder tells her that Max Fenig has an abduction scar behind his left ear. The audience has just been shown the scar to be behind Max Fenig's right ear.
In the scene when Max struggles to escape from the motel, close shot reveals he was caught by the slide-up window. However, in both the preceding shot (when Mulder opens the door) and subsequent one (when Mulder pulls Max back), the window is widely open and locked in upper position.
Max Fenig refers to Scully as "enigmatic agent Scully", yet a few moments later, when an amused Mulder repeats the phrase, he says "enigmatic doctor Scully".
When Mulder and Scully catches Max attempting to escape through the bathroom window of the hotel, Max's hat is knocked off of his head as Mulder pulls him back through the window, but when the camera pans to him, his hat is fully seated on his head.
When searching for the alien entity, a high pitched sound comes out of the headphones of Commander Calvin Henderson and a soldier reports picking a frequency of 200,000 MHz, even though human can hear frequencies that span from 20 to 20,000 Hz.
The reporter claims that Townsend's 12,000 residents are being evacuated. Townsend has less than 1,000 residents.
Max Fenig's abduction scars were behind his right ear, while the other cases in Mulder's file stated that the abductees had scars on the left.
Scully tells Mulder she was told it was a Libyan jet not a UFO. Libya at that time and before its collapse, had no fighter jet with the range to reach the United States' airspace.
When the communications officer is reporting the 'bogie' to his commanding officer he states that the object dropped off the radar screen at 24:17. On the 24 hour clock there is no such time. An Air Force communications officer would have used 00:17. However, later, after the second bogie, the comms officer repeats 2417 but was giving a location not a time as the supervisor then says to her "2417 - isn't that where...?" indicating it is the same location as the first incident.
The doctor treating the first burn victims said they suffered "fifth and sixth degree burns." Burns are only classified as first, second and third degree.
Fifth and sixth degree burns do, in fact, exist. At the sixth degree, the body is charred to the bone, destroying muscle tissue. It is not generally survivable.
When Scully aims at the bathroom door in the motel, the slide of her pistol is moved halfway back, as if it stuck during cocking the gun.
Brent Strait's character is credited as "Corporal Taylor", but his uniform has the rank insignia of a Captain.
When Max Fenig first starts talking to Moulder in the prisoner compound, a large square greenish-white reflection can be seen in his glasses which clearly has nothing to do with the location scene.
Townsend Wisconsin is located in the north east part of the state and an hour from Lake Michigan. The show portrays the city to be close to the lake and the map shows in the in beginning of the episode that the town is located in the southeastern part of the state.
Mountains can be seen in the background of the motel, which is supposed to be in Townsend, Wisconsin. There are no mountains in Wisconsin (and there are no large hills in Oconto County Wisconsin, where Townsend is located), but there are many in British Columbia where the series was filmed up until its sixth season.
When Max Fenig has an epileptic seizure, Mulder straddles him and holds him still. In reality, you do NOT restrain an epileptic during a seizure as you can cause that person to hurt themselves.