The "Consider Yourself" number took three weeks to film.
As a practical joke on Harry Secombe, the makeup 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.
Oliver Reed's only song "My Name" was cut from the finished film, officially because the producers decided that Bill Sikes should not sing, but also allegedly because there was concern over the quality of Reed's singing voice. However, the instrumental version is played in the background when the audience is first introduced to Bill Sikes.