Carradice: If you feel like watching it afterwards (so that nothing is spoiled), there is a movie that somehow dares to complete the story. A mature don Pablos makes the account of his life in flashbacks. But the book is better, and funnier.
Sjuan: Thanks for the recommendation! :)
Now I am reading
The Peony Pavilion by Tang Xiangzu (a spanish translation of the text).
Oops! I made a mistake. Good news and bad news!
The bad news: the movie I told you was about a different book of the same period, within the picaresque genre:
La vida de Lazarillo de Tormes. The good news is that if you liked El Buscón, then you will most likely enjoy Lazarillo de Tormes. Seriously!.
Again, sorry for the mistake, but there you have a free tip :-)