After the shower scene, Mulder and Scully have wet hair, but their clothes look perfectly dry, when they should be completely soaked.
When the girl is alone dissecting the pig fetus, the fetus is all pink with no black spotted markings. But when the girl is shown laying on the floor, the pig fetus has black spotted markings on its hindquarters.
During the pig/hog dissection in science class, the science teacher tosses a pig into the snake tank for feeding. Animals to be dissected would be soaked in formaldehyde and not suitable for feeding.
A python, which consumes its prey whole, would not start with the victim's foot, as the snake is seen doing here with Ausbury - if it did, it would rapidly run into trouble when it reached the groin area. It would begin with the head.
The water drains from the drinking fountain in a counter-clockwise direction, which Mulder states is the wrong direction due to the Coriolis effect. Not only does the Coriolis effect have a minute if any effect on small basins with running water, but also the theory states that sinks in the northern hemisphere should drain in a counter- clockwise direction. So, even if the Coriolis effect were in play, the drinking fountain was actually draining in the correct direction according to the theory.