The Little P. Ranch was built specifically for this film, but it remained standing after filming was completed and would go on to appear in the following movies: ¡Viva la muerte... tua! (1971), La banda J. & S. - Cronaca criminale del Far West (1972), Il mio nome è Shangai Joe (1973), Uno, dos, tres... dispara otra vez (1973), The Spikes Gang (1974) and Il bianco il giallo il nero (1975). The ranch burned down in an unknown year, leaving only the chimney standing. It remains so as of January 2017.
Louise and Maria's fight was filmed in seven days.