The "Consider Yourself" number took three weeks to film.
While filming the scene where Oliver gets a peek at Fagin's treasure, director Carol Reed was not satisfied with the reaction on Mark Lester's face. Later, while re-shooting the scene, he hid a small white rabbit in his pocket and stood behind the camera. As Ron Moody opened the box of treasures, Reed pulled the rabbit out of his pocket. Lester's reaction to the sight of the rabbit was then used in the final 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.