When Professor Dickens dives through the window he is visible diving regularly, but when he dives instead of falling on his stomach he falls on his back.
The FBI doesn't have a field office in Syracuse, New York.
When Scully calls and leaves a message for Mulder, she says that's she's staying off of I-90 in Germantown. I-90 runs from Seattle to Boston, nowhere near the DC area.
ZIP code 21401 is not in Germantown, Maryland.