The Hollywood Reporter has a juicy article up regarding the recent firing and hiring of directors on the untitled Han Solo project. Here's just a small part-
As soon as shooting got underway, insiders say, it started to become clear that Kennedy’s stated intention of hiring directors who would put their own spin on Star Wars movies had led to a mismatch. Some insiders say that while the talent of Lord and Miller is undeniable, nothing in their background prepared them for a movie of this size and scope. These sources say they relied too heavily on the improvisational style that served them so well in live-action comedy and animation but does not work on a set with hundreds of crewmembers waiting for direction.
“You have to make decisions much earlier than what they’re used to,” one of these sources say. “I don’t know if it’s because there were two of them but they were not decisive.” Production department heads began to complain. While the pair appeared to listen when told of festering problems, this person says their approach did not change.
But the source close to Lord and Miller acknowledges they have always worked in an improvisational style and not just to add comedic elements. "They collaborate closely with their actors and give them creative freedom that, in their experience, brings out the actors' best performances," this person says. "Lawrence Kasdan would not allow this and demanded that every line was said word for word. To appease him and the studio, Lord and Miller would do several takes exactly as written and then shoot additional takes."
Matters were coming to a head in May as the production moved from London to the Canary Islands. Lucasfilm replaced editor Chris Dickens (Macbeth) with Oscar-winner Pietro Scalia, a veteran of Ridley Scott films including Alien: Covenant and The Martian. And, not entirely satisfied with the performance that the directors were eliciting from Rules Don't Apply star Alden Ehrenreich, Lucasfilm decided to bring in an acting coach. (Hiring a coach is not unusual; hiring one that late in production is.) Lord and Miller suggested writer-director Maggie Kiley, who worked with them on 21 Jump Street.
When Kennedy felt that these measures did not get the production on track, she asked Kasdan to come to London. Kasdan is said also to have been unhappy with the limited shots and displeased that Lord and Miller were calling out lines for the actors to try from behind the monitor rather than sticking with the script that he had written in collaboration with his son. (Lord and Miller had input on the script before shooting began.) “As a writer, producer and part of Star Wars world, you get on a plane when that happens,” says a person with knowledge of the situation.
But Lord and Miller were not prepared to have Kasdan become a shadow director. With an impasse reached, Kennedy finally pulled the trigger. The next day, when the crew was told that Ron Howard would take over as director, sources say they broke into applause.