Continuity mistake: Early in the movie, when Kevin Bacon and Josh Brolin begin to chase Isabel (the invisible gorilla) down the hall, Kevin does not have any special goggles and didn't grab any when he got the gun. This is confirmed when we see the backs of their heads as the chase begins. When Kevin catches up with Isabel, he brings down his goggles from the top of his head as if he had them all along.
Continuity mistake: When they try to make Kevin visible, they use a blue spray to see his vein (like they did to the gorilla). but you never see the blue mark again...
Continuity mistake: When the veterinary is throwing blood to stain Sebastian, she stains her left breast. A few seconds after, there's no stain.
Continuity mistake: In the end of the movie you can see that the doors of the elevator are almost closed. But in the next scene when Linda shoots him with the flamethrower, the doors are open again.
Continuity mistake: When the redhead spilled the blood all over the floor to see if he was coming at her there is a little area to the left of the screen he could walk on without her seeing it. The next shot it's gone.
Continuity mistake: When Dr. McKay pushes open the freezer door, she is standing behind the row of wires still connected to the door. A moment later, without moving, she is on the other side of them.
Continuity mistake: When the team tries to make Caine invisible, he tears off all the sensors and wires from his chest. Yet the surrounding machines continue to display his heart rate and blood pressure.
Continuity mistake: When Sebastian goes to Linda's apartment to catch her and Matthew together, we see Linda welcome Matt by pulling her jeans down. Matt picks her up, hands on her bare butt. After he carries her into the bedroom, Sebastian throws a rock through the window and we see them on the bed, her jeans are pulled back up to her waist. Not the direction clothing usually goes in such situations.