Around the 27-minute mark Lee Van Cleef's character Talby walks through a street with white buildings. This is the exact same set seen in For a Few Dollars More (1964). also starring Van Cleef (and Clint Eastwood). The particular scene in this film is also shot from the exact same perspective and angle as in "For a Few Dollars More" when Eastwood's character has a short stand-off with three Mexican gunslingers.
In the film, Scott Mary's mule is called Sartana; a common name for a gunslinger character in other spaghetti western films.
The theme song is used in Django Unchained, the training montage scene where Jamie Foxx/Django is practicing his shooting.
Body count: 26.
Apart from John "Doc" Holliday, who is constantly mentioned through the film, there is a reference to another real life personality of the West: Butch Cassidy. Around the 1h43min mark, close to the store, a sign which reads "On July 12, 1882, Butch Cassidy was mortally wounded by Dan Parker." can be seen. This, however, does not reflect reality, since Cassidy was (supposedly) killed only 26 years later, in Bolivia.