The X-Files (1993)

Demons - S4-E23

Visible crew/equipment: As Fox is being led into the jail, when Scully says, "Mulder" the boom mic is at the top of the screen, while she's walking towards him.

00:20:30

Synchrony - S4-E19

Plot hole: Scully's statement that she was 23 when she wrote her senior thesis in college throws off her timeline of college, med school, residency, FBI Academy, Quantico teaching assignment for two years, and X-Files assignment at 28. Her undergraduate degree in Physics should have been completed when she was 20 or 21 to allow at least 4 or 5 years for her medical training.

00:41:35

Never Again - S4-E13

Visible crew/equipment: When Ed turns to go into the office, you see the reflection of the boom mike on the glass window.

00:05:30

Herrenvolk (2) - S4-E1

Continuity mistake: Scully tapes an X in the window,that X changes shape when Scully is talking to Mr. X and before Mr.X dies when he checks on the apartment.

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Leonard Betts - S4-E12

Continuity mistake: When Scully finds out about Betts' mother she says that "She lives right here in Pittsburgh." Nothing wrong there except that at the time they has just left Chuck Burks' lab - which is in Maryland.

00:17:40 - 00:21:10

Musings of a Cigarette-Smoking Man - S4-E7

Other mistake: In the episode "Musings of a Cigarette Smoking Man," when CSM is writing his letter of resignation on his typewriter, you can see that the letters are already there - he is simply typing over them.

00:39:30

Musings of a Cigarette-Smoking Man - S4-E7

Other mistake: When the CSM is aiming at the door, it must be quite difficult for him because it seems that he forgot to take off the protective lid from the night vision rifle sight.

00:35:10

Musings of a Cigarette-Smoking Man - S4-E7

Continuity mistake: In other episodes the name of The Lone Gunmen's newsletter is "The Lone Gunman", but in the shots of their office door it has a sign saying "The Lone Gunmen. Publishers of 'The Magic Bullet' newsletter."

00:43:10

Demons - S4-E23

Visible crew/equipment: When Scully asks Fox "Do you know what day it is?" the boom mic drops down at the top of the screen.

00:04:50

Synchrony - S4-E19

Continuity mistake: In the shot of the 6th Precinct police station, it has a California state flag flying out front. The episode took place in Massachusetts, at the Massachusetts Institute of Technology.

00:07:45

Unruhe - S4-E4

Continuity mistake: Scully was bound with tape to the chair, but in the last scene she gets out of the chair after Mulder frees her hands, but without freeing her legs.

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Tempus Fugit (1) - S4-E17

Other mistake: When Mulder opens the body bag containing the "partial" remains of Max Pfennig (AKA Paul Gidney) a pulse can be seen beating in the right side of the corpse's neck.

00:18:10

Demons - S4-E23

Factual error: The date stamp says that it is April 12 and Scully says that it is Sunday, but April 12, 1997 was a Saturday.

00:03:10

Sanguinarium - S4-E6

Revealing mistake: When Mulder and Scully enter the doctor's house, you can see over their shoulders that it is showering with rain outside, yet both of them are bone dry.

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Small Potatoes - S4-E20

Continuity mistake: We see Scully wearing pants while sitting on the couch, but when the real Mulder comes in, she jumps up and we see she's wearing a skirt.

00:38:35 - 00:41:25

Herrenvolk (2) - S4-E1

Continuity mistake: Jeremiah Smith and Mulder are with the kids, and in the background, when CSM is looking through the window, Samantha's clone and the other kid disappear.

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Tempus Fugit (1) - S4-E17

Continuity mistake: During the handbrake turn Scully smiles, although in the preceding and following shot her face is very serious.

00:31:15

Synchrony - S4-E19

Deliberate mistake: When the unconscious, naked Asian doctor is removed from the warming tub, his hands are clasped over his crotch to protect his modesty, despite the fact that he shouldn't be able to do that, since he isn't conscious and his previously frozen limbs are now pliable and relaxed due to the heat.

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Unrequited - S4-E16

Deliberate mistake: When Mulder is about to go into the metal detector he puts his gun on the counter. He goes through the metal detector on his cell phone but his keys set it off, when he steps through again it doesn't go off. No cell phones can go through metal detectors without setting it off.

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Terma (2) - S4-E9

Continuity mistake: The truck stolen by Mulder from the Russian labor camp is Unimog 406. However, during the accident scene, when it comes out of the woods and falls from the hill, it miraculously turns into Unimog 404 model.

00:13:30