Other mistake: When Sebastian starts thrashing around he breaks restraints strong enough to hold an adult gorilla.
Other mistake: After the veterinarian throws blood all over the floor, we see clean spots appear on the floor in the shape of Sebastian's feet as he walks through the blood. Somehow he never has any of it stick to the bottom of his feet (even when he's in the puddle).
Other mistake: Elisabeth Shue uses the blowtorch to set off the fire sprinkler in the hallway, but later there is a raging inferno in the lab with all the important data and equipment and there's not one sprinkler, nor any alternative "electronic equipment friendly" automated fire suppression mechanism such as Halon gas.
Other mistake: When the subject is invisible, and the crew are attempting to return it to normal, when they inject the orange anti-serum into both the gorilla's and Caine's bloodstreams, it makes a noticeable "slooshing" noise as it rushes through their veins, which, technically, should make no noise at all.