Visiting NASA was especially helpful for the animators as they needed to know the textures of many surfaces. In the space agency, they were surprised that they were dedicated to photographing "a piece of telephone or the ground", revealed the scriptwriter Jordi Gasull in the presentation of the film. In the movie, they also used a member of the team as a reference to get an idea of the height of things. His name is Galo, so the team started talking about measures such as "half a Gallic", "three-quarters of a Gallic" or "two Gauls". The team also thought about including in the story the resource Helium 3, an isotope that could be a source of clean nuclear energy. This element actually exists and it is rare on Earth but abundant on the Moon, giving more motivation to the villain Richard Carson.