The Ballad of Lady Frances - S5-E17
Continuity mistake: While talking with the guitar expert, Joan places the guitar down on the sofa with the fretboard facing away from her. When the guitar expert comes and sits down next to her, the guitar's fretboard is suddenly facing her.
Chosen answer: M broke into the brownstone and left a note. Holmes deduced he was staying at a high-class hotel from the soap scent on the note, and gave a picture from a hidden camera to his "irregulars" on the street to stake out hotels. One of them saw him, so Holmes followed him to his next intended victim and knocked him unconscious with a baton.
Sierra1 ★