Character mistake: After Cal goes to the secret lab in Georgia, he and two others go into his new lab. When they enter a cat jumps up on the counter. Dr. Adams says "This is Neutron. We named him that because he's so positive." Neutrons are neutral and electrons are negative. It's protons that are positive. They should have named the cat Proton.
Continuity mistake: When Cal and Joe run the experiment after Cal has just returned from the lab, Joe goes from having no glasses to suddenly having them on. (00:08:50)
Other mistake: When scientists Cal and Ruth exit the spacecraft in their high-winged light airplane, the aircraft's ID markings are reversed while in flight. All other scenes with this light plane's ID markings have the image correctly displayed.
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. (00:08:50)
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.
