So it was that, after a fair amount of executive meddling, from removing some of the incidental gags that did nothing for the plot, to changing the title to the more dynamic if also more generic The Great Mouse Detective , the project was approved, with Clements and Musker making their directorial debuts, aided by storyman and animator Dave Michener (who, having worked on "Winnie the Pooh and the Blustery Day" , was the most senior member of the directorial team) and storyman Burny Mattinson, the only one of the four who'd ever directed anything, the 1983 short "Mickey's Christmas Carol" .