"Well I would never say to anybody that Warren Beatty got fired, but uh, I think he and Quentin fell out of love, and I think Warren told Quentin to hire me for the film"

This quote by David Carradine suggests that he was employed to replace Warren Beatty in a movie directed by Quentin Tarantino. It indicates that Beatty and Tarantino had a falling out, which Beatty was fired from the task. Carradine's words recommend that Beatty was the one who suggested that Tarantino hire him for the film. This could mean that Beatty was still on good terms with Tarantino, and wished to assist him out by suggesting Carradine as a replacement. It might likewise suggest that Beatty was trying to distance himself from the job, and wished to ensure that someone else was worked with in his location. Either way, it's clear that Beatty and Tarantino had a disagreement that led to Beatty's departure from the film.