Surprising Unprofessional Sequence
Late in this otherwise superb film, there's a solo delivered by Keel from a catwalk, surrounded by the audience for the play-within-the-play (I think it's "Where Is the Life That Late I Led?"). The trouble is that he plays most of the scene with his back turned to a large part of the audience, and that is something no competent actor and director would ever do. It is NOT a minor, negligible oversight.
"Believe not what you only wish to believe, but that which truth demands"