Terence Hill fasted for 24 hours before filming the scene where Trinity eats the skilletful of beans, to be able to finish them all (and quickly).
Breakthrough film of Italian actors Terence Hill and Bud Spencer. The picture was their first really massive international box-office hit and made the two actors super-stars.
This was a spoof of the then popular "spaghetti western" genre. It became such a huge hit that it reportedly grossed more than the very films it was spoofing.
Trinity's (Terence Hill) nickname was "The Right Hand of the Devil". (The type of gun Trinity had was a Colt 45.) Bambino's (Bud Spencer) nickname was "The Left Hand of the Devil." (The name Bambino is Italian for "baby".) Both men were expert shots. "The Devil" was a nickname for their mother, a New Orleans madam.
The filming location is a valley near "Camerata Nuova", a small Italian town, close the border of Lazio and Abruzzo regions, and Almería, a small town in the South-East of Spain where a lot of movies, including spaghetti westerns, were filmed.