Continuity mistake: When the CSM discovers the bright spot on the carpet, he immediately realises that Mulder's apartment was under surveillance. However, one can notice that soon after entering Mulder's apartment, the CSM looks down at the floor and carpet covered with blood and there is no bright spot. (00:14:00)
Continuity mistake: During the meeting at a horse track, after the CSM says "You need my expertise, " the First Elder raises his head. In the following shot from the other side, he raises it again. (00:21:00)
Redux II (3) - S5-E2
Continuity mistake: Although the subtitle states 12:00 AM, Mulder's watch hands mark 02:35. (00:43:16 - 00:43:39)
Factual error: When Byers asks Langly to try under active cases to find Holly Modeski in the FBI database, Langly only presses two or three keys on a keyboard, which is obviously not enough to enter "Holly Modesky" to the search engine. (00:19:40)
Factual error: When two unidentified men who approached Susanne Modeski in the warehouse take out their handguns, they have regular pistols. However, when they start to shoot, continuous fire is heard that could only be produced by an automatic weapon. (00:28:40)
Suggested correction: Fully automatic pistols exist, such as the Glock 18.
Continuity mistake: When the Lone Gunmen speak with Susanne Modeski, in the background there are some cars parked in front of the Stadium Inn. However, just seconds after, when the telephone rings, there is a white truck parked at the entrance. Later on, the cars are back again. (00:38:55)
Visible crew/equipment: When the Lone Gunmen catch up with Suzanne at The End of the episode, when she is talking to them and the camera is on the three, you can see not one, but two boom mics at the top of the screen. (00:40:20)
Factual error: When Suzanne Modeski retreats to the restroom with a pair of pliers to pull out her tooth, she is only gone for approximately 15 seconds before the gunmen follow her. For a petite woman to rip out a strong, healthy molar from her own mouth (which also had metal prongs Underneath in her gum) would not take so little time, no matter how determined she was. It's also highly unlikely that the lack of anaesthetic would have allowed her to do so without making pained noises.
Continuity mistake: During the shootout in the warehouse, a wedding ring is visible on Mulder's finger. While it's possible Mulder was married before, the Lone Gunmen are shown hacking into Mulder's FBI dossier and Langly reads out that he is single.
The Post-Modern Prometheus - S5-E5
Continuity mistake: Izzy unwraps a peanut butter sandwich and sets it on a bare tree stump as bait for 'the Great Mutato', then he steps away with the others. When we see the Great Mutato hurriedly put it down, a paper bag is suddenly sitting on the stump beside the bitten sandwich.
Continuity mistake: Scully's FBI badge number that she gives to the phone company is different to the one she gives in season 4's "Teliko". (00:02:05)
Continuity mistake: The toxicology report lists the birth date of Mrs. Sim as 6/6/67 which would make her 30, but Detective Kresge says that she is 40 years of age. (00:03:45 - 00:14:10)
Plot hole: On the phone, Scully asks for the report on her sister to be sent to the San Diego F.B.I field office (since she is visiting her brother and his wife and so is not in Washington), but the package is sent to her brother's home. Even if 'Danny,' whom she asks for the file, decided to be helpful and send it directly to her, her brother's address is not likely to be the one in her personal file, plus she didn't mention that that's where she'd be staying.
Revealing mistake: The dead Mrs. Sim is supposed to be nude in the bathtub, but for a brief second, a glimpse of her head and shoulders reveals the very top of a flesh-coloured modesty wrap covering her breasts. This may not be visible in a non-widescreen format release.
Continuity mistake: Mulder says that Scully was abducted and missing for four weeks. In "Duane Barry," the date stamp is given as August, then in "3," when Mulder returns to the X-Files office he turns the calendar all the way to November. Since Scully is returned the next episode after this, she must have been missing for at least 3 months, not 1. (00:06:20)
Kitsunegari - S5-E8
Continuity mistake: How was Modell tried and convicted in 1996 if he only woke up six months ago? Six months before this episode would be at least mid 1997. (00:06:05)
Kitsunegari - S5-E8
Revealing mistake: When Scully pries open the mouth of the man who died from being forced to ingest paint, his eyes twitch. (00:13:50)
Schizogeny - S5-E9
Continuity mistake: After her father is pulled out of the window, Lisa leans out and there is no glass left on the sill, she even places her hands on it. Later when Mulder and Scully look at it, there is all sorts of jagged edges on the sill. (00:16:35 - 00:20:00)
Schizogeny - S5-E9
Revealing mistake: A heavy rain is falling but there is no sign of it on Mulder and Scully. (00:32:00)
