On the poster outside the nightclub Dennis Morgan's character, "Vince Nichols", is listed as a "popular baritone". Morgan is a tenor.
(at about 51 mins) Just after Bennington arrives and meets the three "sisters" he picks up a photo of Vince to scrutinize the dedication/signature at the bottom. When he is first seen to be reading the photo he is not wearing glasses. Seconds later, in the next cut, he is wearing glasses. A person who needs reading glasses would typically reach for them while (or before) picking up something to read closely.