Partially into the films production, Bakshi got into a fight with one of the producers. This resulted in the producers seeking to fire Bakshi and hire Chuck Jones to finish directing the film. When Jones was approached, he declined.
Half way into production as Bakshi was fired (before being re-hired). A different director stepped in and animated a train sequence in which Michael goes to visit his brother-in-law. He is on a subway and witness' a woman sleeping while two men begin to undress her. Michael just watches. As the woman wakes up, she screams "rape" toward Michael. This was in the original script, but was scrapped when Bakshi returned to the project, as he felt the scene was in bad-taste.
Also in the original script was an alternate ending. It was a car chase scene that takes place throughout New York City. During the car chase, penny arcade war games are being flashed throughout the sky. This idea was never completed due to lack of budget and thus the current ending was used.