The "Consider Yourself" number took three weeks to film.
As a practical joke on Harry Secombe, the make-up department created a false ear for Mark Lester so that when Secombe grabbed the boy's ear, it came off in his hand.
Amazingly, the composer of this highly respected score, Lionel Bart, like his contemporary, Leslie Bricusse, could not read music himself. From his earliest days in theater, he would sing his melodies to a trained pianist, who would then set the tunes down on sheet music and orchestrate them.
Mark Lester recalled how he (and the other children) were terrified of Oliver Reed throughout the production as Reed chose to remain in character as Bill Sikes at all times when on set.