At about 15 minutes into the movie, Detective Murdoch is interviewing Mr. Eakins, in his home. When Mr. Eakins is shown from his left side, the organ has its keyboard cover open, revealing the keys and stop knobs. When Mr. Eakins is shown from straight on, the keyboard cover is closed, concealing the keys and stop knobs.
When Murdoch examines the body of the policeman he does not bless himself as he normally does. It seems strange that this is the case, particularly given that it is a colleague.