Del mencionado libro:

"Leslie Howard was given a codirector screen credit with Asquith on PYGMALION, but Lean declared that Howard was not especially interested in directing at the time. After principal photography commenced on March 11, 1938, Howard limited his role as codirector to occasionally offering Asquith a suggestion or two during the rehearsal of a scene - but he was usually on the set only for the scenes in which he appeared".