As Attila Mellanchini is shot by the communist partisans on VE Day, a close-up is shown of a man's hand holding the pistol to Attila's head. The pistol in his hand is a Beretta M951, which only began production circa 1953 - eight years after the war ended.
In the movie, Olmo is depicted as coming back from World War One, while Alfredo, even though conscripted, manages to stay at home thanks to his father's connections. In reality, people born in 1901 (like Olmo and Alfredo) were never conscripted to fight in the war, as they were only 17 when it ended in November 1918. The last ones to be conscripted in Italy where those born in 1899.