The original British theatrical release had about 4 minutes cut by the BBFC. Many closeup shots of bloodied faces and bodies (including the body of Chico) were removed, as well as a shot of Ramon dripping blood from his mouth. The main cuts however were to the beating up of Eastwood, which lost a hand stomping scene, and extensive cuts to the assault on the Baxters house which was cut to shorten the overall sequence by removing all shots of men on fire and the shooting of Consuela Baxter (the cut version removes the shot of her falling backwards). The 1999 MGM video and DVD releases are fully uncut and the same as the USA DVD release.
When the film first aired on American TV in February 1975, a network executive ordered the creation of a new prologue (directed by Monte Hellman) to give a moral justification for the lead character's killings: a prison warden (Harry Dean Stanton) commutes "The Man With No Name's" sentence if he goes to San Miguel and restores order to the town. Neither Eastwood or Leone participated in this new sequence ("The Man With No Name" is seen only from the rear), and this distortion of Leone's creative vision has reportedly been dropped from subsequent presentations. This prologue can be found on the Special Edition DVD.