The role of Santoro, the killer played by Francesco Siciliano was originally offered to Franco Nero.
Luca Magri to play the role of Leo Piazza was inspired by Alain Delon in Le Cercle rouge.
The movie that Leo Piazza is watching on TV is Dawn of the dead.
Massimo Vanni who plays Moriero, worked on the film also as the master of arms.
Elena Radonicich's debut.