- Kubrick once said "If Malcolm [McDowell] hadn't been available I probably wouldn't have made the film."
- It is said that Stanley Kubrick made this movie because of the failure of Waterloo (1970/I). After he completed 2001: A Space Odyssey (1968), he had planned to film a movie about Napoleon's life. After many years of research, he sent location scouts to various Eastern European locations, and even had an agreement with the army of Yugoslavia to supply troops for the vast battle scenes. However, after Waterloo tanked, Kubrick's financial backers pulled out. He thus decided to adapt the American version of "Clockwork", which had been given to him by Terry Southern (co-writer of Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb (1964)).
- The film rights were sold for "a few hundred dollars", but then re-sold for a much larger amount. Before director Stanley Kubrick become involved in the film, several different casts were considered for Alex and his droogs: girls in miniskirts, old-age pensioners, and The Rolling Stones.
- During the filming of the Ludovico scene, star Malcolm McDowell scratched one of his corneas and was temporarily blinded. He suffered cracked ribs during filming of the humiliation stage show, and he also nearly drowned when his breathing apparatus failed while being held underwater in the trough scene.
- The snake, Basil, was introduced into the film by Kubrick when he found out McDowell had a fear of reptiles.
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