The photograph of Doctor Lawrence's wife is a photograph of Peter Cushing's own wife. She had died shortly before filming began, and his tears are real.
In the USA this film has been released as 'Night Of The Ghoul' and 'The Thing In The Attic'. Contrary to belief in some quarters, the film is not in the Public Domain - the rights-holder is still Tyburn Film Productions.
According to Veronica Carson, Director Freddie Frances made Peter Cushing do multiple take during the scene where he talks about his love for his wife. This cause Cushing great distress and reduced the great actor and some of the crew to tears.
At c. 27 minutes we see Peter Cushing tuning his violin but he is not playing the open strings that we hear. Furthermore, later shots of his violin playing are extremely badly mimed.