Italian actor Lorenzo Balducci was cast at the very last minute. He had just one day to read the script and give his agreement.
Irán Castillo had to commute from Guadalajara to Mexico City every weekend during the filming since she was also appearing as Dorothy in "El Mago de Oz 2010" stage production.
Principal photography for 31 días (2013) actually lasted 31 days in Guadalajara, Mexico. Three more days of shooting took place in Mexico City.