Ed says to Karen: "Radon is an odorless, colorless gas that's produced by natural breakdown of radium, earth, rock and water." Actually, radon (Rn, atomic number 86) is a naturally occurring *decay* product of uranium (U, atomic number 92), thorium (Th, atomic number 90) *or* radium (Ra, atomic number 88). All four are elements - earth, rock and water aren't.
The supposedly Russian ships have western lettering and signs written in English.