Continuity mistake: As Mulder and Scully enter into the building that houses the bees is seems Mulder's tie gets blown over his right shoulder and then he is seen inside and it is over his left shoulder. (01:00:30)
Continuity mistake: When Blade gets captured and stabbed in the room where the "Vampire Bible" is, he is not wearing an ear piece. In the next shot, he is. (00:51:45)
Continuity mistake: Velma adds books to the pile in front of her when she takes the telephone order. Looking down the pile, you don't see any trace of the random loose papers that appear when she hauls the whole lot to the desk with the TV on. (00:06:25)
Continuity mistake: When Casey and Delilah watch Nurse Harper get infected by Coach Willis from inside a closet, the closet's shutter windows switch from closed to open between shots.