Continuity mistake: Shortly after the movie starts, Cal's plane lands and they go into the lab. Cal looks through a scope at an experiment and his assistant is next to him without glasses. After the experiment flames out, they show the men again but now his assistant is wearing glasses.
Continuity mistake: Three scientists escape from the lab. The car stops and two get out and go into a pond surrounded by water. They dip under the water as the car explodes. When they come up they are still surrounded by water. Next, the German scientist shows up and they dip under the water again. After the explosion the camera shows the two in the pond again but now they're surrounded by reeds.