Robert Downey Jr.'s Doctor Dolittle movie has already seen its release date pushed nine months, and now we know why -- it was in desperate need of surgery. Universal and producers Joe Roth, Jeff Kirschenbaum and Susan Downey saw an early cut of the big-budget movie and decided to bring in Chris McKay (The Lego Batman Movie) and Jonathan Liebesman (Teenage Mutant Ninja Turtles) to help director Stephen Gaghan save the patient, so to speak. To recap, The Voyage of Doctor Dolittle finds a live-action Downey playing the unconventional doctor who can speak to CG animals. Rex Harrison …