Question: Can someone explain how all the special effects were done, such as the electronic blasters rays, and the sound effects? As the film was from 1956 there were no electronic keyboards then and the sounds are very futuristic.
Question: With such an advanced ship and a crew of highly trained specialists, why would they need the services of a human cook? Wouldn't an automated chef do the same work and save the resources required for such an unnecessary position?
Answer: This is a lightweight, unsophisticated 1950s sci-fi movie with little thought to scientific accuracy. Space travel wasn't possible at this time and most people had little knowledge of what that would entail. Screenwriters just "improvised." The movie was meant as pure entertainment with a humor-infused plot. The "cook" is just a comic-relief character.
Answer: Many of the sound effects use an electictronic instrument called a theremin which was invented in 1919. You may hear it used more musically in The Beach Boys song "Good Vibrations." The visual effects would have been animated composites as used in Star Wars and Ghostbusters.
Myridon