Factual error: You see the serum flow toward the heart and then branch out through the rest of the body. The same thing happens when they try to do it with Kevin Bacon. In ANY normal circulatory system, blood that reaches the heart from the veins has to go straight to the lungs to be deoxygenated before it gets sent to the rest of the blood. The serum clearly doesn't do this - the only way that anything could skip the lungs so blatantly is if there was a hole in the heart.

Continuity: When Kevin Bacon and Elizabeth Shue's boyfriend shoot the gorilla, the gorilla passes out. No one moves the gorilla, yet the red headed veterinarian walks right through the area where the gorilla passed out.

Factual error: The speed used to administer the serum to Sebastian is not close to the reality. At that speed the vein would have exploded.

Factual error: The braking system on lifts (elevators) is designed to stop a free-falling car safely and quickly (using gravity and a wedge system). It would not take a long time to stop the car or break up as shown in the film.

Continuity: The "tranquilliser guns" are really PGP paintball pistols. The little tube on top only has a little hole the size of a paintball you load it, yet in the movie they seem to hold a good amount of large darts in that tiny gun.

Continuity: When Isabelle (the gorilla)'s body hair is returning, you can see Linda (Elizabeth Shue) touching it. In that shot, the leather belt above Isabelle's body actually seems to be hovering above her - it is not resting on her.