The first alien has blue skin in the face but, when he raises his gloved hands, we see his wrists are pink.
In episode Tiempos revueltos (2009), the Captain identified Querejeta as a full officer (oficial). Here, the Captain says that Querejeta is a non-commissioned officer (suboficial). In the next instance, El bucle infernal (2009), Roswell will again identify Querejeta as an officer.