- The architectural frame of the "Rock of Gibraltar" in Chapter 1, page 4, belongs to I.E.S. Virgen de la Esperanza, a high school in the city of Linea de la Concepción. It is the first thing that you see when you enter the school, amazing all its visitors.
- The author has been inspired by his students, taking the personalities of some and the physical features of others. These students are over 20 years old today.