Just a snippet from the Wall Street Journal’s interview with Michael Bay:
“According to the Wall Street Journal, and as previously reported, Joe Roth split from Disney leaving Peter Schneider to take his place. In the early development of the film, when the budget was being estimated at over $200M, Schneider suggested that Bay be given his leave in favor of a director who could craft the film on a smaller budget. Word has it that Jerry Bruckheimer threatened to walk if Bay was axed, thus ending that.
In addition, in order to save on money, Disney wanted Bay to scuttle the Doolittle raid on Japan at the film’s finale. This and the studio’s demand that the helmer bring in the picture with a PG-13 rating rather than an R threatened to capsize the project with word that Bay was contemplating walking. Bay eventually won on the Doolittle front, but the film will be PG-13.
Still, though Bay got Doolittle, the studio demanded and got a studio executive on the set whose daily task was to watch the film’s budget, which would seem to be stepping on the toes of Bruckheimer’s responsibilities. (Cinescape)