Continuity: When Alex goes out from the cat woman's house, his pants are white and clean; then Dim crash a bottle onto his face and before falling down Alex's pants are dirty at knees. In the following scene, at the interrogation, his pants are clean again.

Continuity: In the scene where Alex and his droogs come in on Billy Boy making ready to rape the young girl, the first shot shows the lacing of a shoe or sandal on the girl's left calf, but afterwards it jumps to her right.

Continuity: In the sped-up sex scene in Alex's bedroom, watch the bedclothes spontaneously rearrange themselves.

Continuity: When Alex is seeing the prison governor about being released, the governor's glasses are on a pile of papers on his desk. From various camera angles they are on some files, back on the papers or halfway between.

Continuity: In the fight with Billy Boy, many droogs lose their hats and have them on again many times during the scene.

Revealing: During the driving scene, the background is illuminated by non-existent headlights. It's running backward on the projection screen.

Continuity: When the governor is talking to Alex about having the procedure done, the governor says "Tomorrow you will go..." and the position of his hands changes quicker than he could have moved them.

Continuity: In the film's opening scenes, Dim has a black mark on his leg which is clearly visible. When he and Alex start fighting, it has disappeared.

Continuity: The main character's name is several times in the film mentioned as 'Alexander DeLarge', but in the newspaper articles detailing his release from prison, they call him 'Alex Burgess'. Burgess is the surname of the author of the book the film is based on, so they might have originally intended to name him so as an homage.

Deliberate "mistake": In the scene where Alex, after having been released from prison, is standing near Albert Bridge and staring down at the River Thames, the tide line, as measured by the bridge's support column, changes several times.

Continuity: Look at the scene where Alex beats Georgie and Dim and they fall in the river. Alex politely offers his hand to Dim, and in the background you can see Georgie with no hat. Shortly afterwards, he's got his hat on.

Continuity: When Alex is eating spaghetti with the writer and the two reporter types at the end, Alex has a napkin on the table. When the shot changes at the end of the scene the napkin is gone.

Continuity: When Alex is welcomed to jail, he has to remove his clothes, which are put in a box by a guard. The guard's right hand changes positions with the camera angles. Sometimes his hand is lying on the box, sometimes on the box cover beside it.

Other: During Alex's fantasy after he says, "I knew such lovely pictures." they show a bride being hanged. You can see the "bride" has a beard.

Continuity: At the beginning when Alex and his boys go to the old theatre you can see Billy Boy, who is preparing to rape a girl, then loses his hat and the very next moment he has it on, as if nothing has happened.

Continuity: When the cops have Alex in the holding cell and he is bleeding, a cop throws a pile of napkins at him and one of them lands on his leg. In the next shot, the napkin has disappeared.

Continuity: When Alex, the writer, and the other two political people are sitting at the table near the end of the movie, not only does the amount of sauce change on the spaghetti, but the amount of spaghetti changes from shot to shot even after Alex has stopped munching on it. This isn't part of the director's ploy.

Continuity: 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].

Revealing: At the speed their supposed to be doing in an open vehicle, their hats stay on their head. The vehicle is obviously stationary in front of a projection screen.