Goofs

When the fish-tank exploded, loads of water is splashing everywhere. But when the camera close-up at the ground, the floor is dry.

When Scully reads the post-mortem report, she reads out a note "marked bradycardia" suggesting "drowning in sea water". Bradycardia is a slow heart rhythm. There's no such thing as an irregular heart rhythm of a deceased person who is a subject to autopsy.

Buffalo does not have a Chinatown.

In the final act when the fish tank exploded and jettisons glass everywhere, Michelle hadn't moved, so when there is a close up of her feet and she moves away, there is shattered glass under her feet, something which is obviously not possible if she hadn't moved.

At around 10:00, when Mulder is talking to Dr. Sheila Braun, she references "dissociative disorders," in this case likely referencing Dissociative Identity Disorder (formerly Multiple Personality Disorder), going by the DSM-IV. Mulder replies, "as in schizophrenia," to which she nods in agreement. Psychotic disorders, including schizophrenia, are often confused with Dissociative Identity Disorder, but have little to do with each other. Schizophrenia is "a mental disorder characterized by a breakdown of thought processes and by poor emotional responsiveness." However, the drug Michelle is put on (Thorazine) is commonly used to treat various psychotic disorders.

In the opening scene, a detective finds a lost girl in the alleyway. The next scene she brings the child back to the station and puts her in the room to be interviewed by a older male investigator, alone. This scene takes place in 1994 and it would have been against guidelines to have a child in a room with anyone with out guardianship assigned by the courts to represent them. At the very least, two people must be presented to do the interview.

The corpse blinks quite noticeably during an autopsy.

The corpse's abdomen moves during autopsy in two different shots.

Although the scene at about 43 minutes was supposed to be at night, when the lights went out in the house, there was daylight showing through the window.

Michelle Bishop (Andrea Libman) is wearing the same sweater that young Samantha Mulder (Vanessa Morley) used in a photograph from 1972 when she was 8 years old (Little Green Men (1994) and The X Files (1998) ).

When the man gets his tie trapped in the bus door, the driver of the bus is a different driver. This happens when the camera changes from the side door of the bus to the front windscreen view while the bus is in motion.

When the scarf is wrapped around the hand rail of the bus, and in the following scenes, you can see the other end of the scarf hanging down his shirt. Why would he have not been able to just remove the scarf?

21:13 mins in (netflix version) when the detective steps off the bus and has his scarf ghostly lift up and get trapped in the doors and he gets dragged, we see that the bus driver is a young black man, however @21.53/54 the front shot of the bus shows a middle age white man driving the bus.

When Mulder goes to break the glass on the door around 39:30, he hands Scully his gun from his right hand. He's holding a flashlight in his left. Either option would have been a better choice to break the glass, rather than his elbow that he uses.

Around 24:50 Mulder and Scully are looking at an evidence checkout log. There's a column indicating the department of the person checking out the evidence. There are 2 department entries, "Fellonius Crime". Felonius is spelled with a single "l".