It was accused of plagiarism by 'Corita Viamonte', who wrote a 1963 novel called 'Red Eagle' (aka 'The Masked Swordsman') with the same beginning, general plot, and title.
The role of Loles León was written for her.
Season 6 originally consisted of 21 episodes, but the network singlehandedly decided to split it into two shorter seasons (13 and 8 episodes each one) and aired them four months apart, regardless of how this affected the storylines.
As the network is a State-owned company, due to a big budget cut, the network was forced to make a hiatus in the airings from January 2012 (Season 4-Finale) until May 2013 (Season 5-Premiere). Now, the show continue shooting like nothing happened, so by the time the season 5 premiered, half of season 6 was already filmed.
Lucrecia was temporally written of the show due to Miryam Gallego's pregnancy.