Other mistake: At The Beginning when Mulder and Scully leave the room and walk across the FBI office you can see and hear the camera get knocked to the left by something (it was probably the filing cabinet that they walk past a second later). (00:05:19)
Factual error: Atlantic City, New Jersey really doesn't have woods around it like it does in this episode.
Continuity mistake: Near The End of the episode, Mulder is reviewing black-and-white photos of The Jersey Devil. A wedding ring is visible on The Jersey Devil's left hand in the photo. Earlier in the episode, she is not wearing the ring.
Audio problem: The man changing the flat tire in The Beginning of the episode drops his flashlight. He says "dang it" but his mouth doesn't move.
Answer: As he stated many times throughout the series, Mulder needed Scully to be sober and skeptical. Whenever Scully's skepticism wavered and she started questioning her own rationality, Mulder would try to restore her sense of skepticism, because he needed her to be clear-thinking.
Charles Austin Miller