If Ivo was a baby or not born yet when Federico marries Luisa is often contradicted. In some episodes it is mentioned that Ivo was a baby when they married. Once it is claimed that he was a toddler. Yet, many times it is also said that he was born after the wedding.
Ivo's age is never clear. Based on the backstory of Federico and Luisa marriage Ivo was not older than a baby - if he was already born at the time of their marriage. This would make him 18 or 19 at the start of the novella, because he would have to be close to Milagros' age. However, the character is portrayed to be older since it is said that he has been working at the firm for a while and has been able to build his name up to be recognized as one of the best businessmen in the country.
Marina leaves Pablo after she announced her pregnancy, she comes back after two months with a baby that is close to a year old.
In many episodes actresses change hairstyles throughout the scene, or from one moment to the next. This is especially seen in Lina's hair color.