Trivia: According to actor Malcolm McDowell, director Stanley Kubrick was concerned that the Droog attack on F. Alexander and his wife would become just another dark, cruel and violent scene in a movie that was already full of dark, cruel and violent scenes. Kubrick wanted the Alexander home invasion to stand out as genuinely horrifying, but he was at a creative impasse. After Kubrick shut down production for several days to ponder the problem, he thought of Alex dancing during the attack. Malcolm McDowell suggested dancing (and singing) along to "Singin' in the Rain," as it was the only song to which he knew all the words.
Trivia: The movie is actually not the entire story of the book. The US release was published without the final chapter because Burgess' New York publisher thought it was a kill joy and believed US audiences wouldn't like it. Stanley Kubrick decided to write the movie based on the US version, thus leaving out the final chapter.
Trivia: During the filming of the Ludovico scene, Malcolm McDowell actually had one of his corneas scratched. He states that he didn't realize it until he was leaving the set that night and the anesthetic wore off. He also states that it felt like someone hammered a nail into his eye.
Trivia: The opening scene for A Clockwork Orange is spoofed in the opening for "Conker's Bad Fur Day" (a game for the Nintendo 64). Both movie and video game have Purcell's "Music for the Funeral of Queen Mary" playing while the camera zooms out, showing both Alex and Conker drinking a glass of milk.
Trivia: When Alex and his 'droogs' are driving up to the 'Home Sweet Home' house, in the background you can see a figure running to a tree. It's very dark and hard to see, so it could admittedly be a horse or something; but it is there. [It is a horse, so not a mistake as such. Still worth looking for].
Trivia: Director Stanley Kubrick received death threats because of this film. Although the film wasn't banned, it was difficult to obtain a copy in the United Kingdom for many years.