The funniest bits are the gravity antics. When the first scout ship turns off the thrusters and the crew all unfastens their safety belts, one of them flies up to the ceiling. He is so surprised, clearly no-one told this astronaut that there was no gravity in the spacecraft. They help him down and the chief tells him that there is no gravity in the ship. Then they all begin walking around completely normally.
Gravity is not caused by the motion of atoms, and reducing the temperature of an object to absolute zero - which is deemed impossible - would not render it weightless.
The strings holding the flying machines (rocket ships and flying saucers) aloft are clearly visible in several scenes.