La primera ametralladora del Oeste

Joe Gray, Dean Martin's long time stunt double, died of a heart attack during production while on location in Mexico.

During the attack at the bandits' village, Baker (Dean Martin) starts shooting with the Gatling gun. The moment he starts shooting, the magazine falls from the gun but the gun keeps firing. The next moment the magazine is on 5he gun again. The same thing happens once more, as Baker shoots the bandits on the church's' s roof. The magazine falls from the gun, the gun keeps firing and the magazine is on the gun again.

Paradoxically--considering its definition--the film's title is presented in all lower case letters, as can be seen in the poster.

Referenced in My Husband, the Producer (1974)