There's a scene in the movie Destination Moon, where the heroes find out that Joe, the obligatory Brooklynite in every movie of that era, made the mistake of lubing the mechanism that allows them to deploy the antenna so they can communicate with Earth. Everyone in the rocket, which is now on the Moon, is aghast at what Joe has done. They exclaim that the cold vacuum of space has made the lube freeze and they'll have a devil of a time in getting the antenna to deploy. It turns out that Joe actually had the right idea, all along. Oops. Heinlein and George Pal worked very hard to try and get the science right, but this is, apparently, something they screwed up. By lubing the antenna, Joe would have prevented it from cold welding together and made it possible to be deployed.