When Raymond comes to his aunts room, drunk, he is seen spilling the remains of his drink in a theatrical gesture. After a cut to Ms Marple, scolding him, his glass is full again when he goes to sit down on the edge of her bed.
The goof item below may give away important plot points.
Sister Clotilde said that she moved Martin Waddy/Ralf Collins into Michael's room and kept him as her secret. Since Martin/Ralf was close to death, he couldn't assist and as it was her secret she couldn't get one of the other nuns to help. How did she move such a large man, by herself from his bed to the secret room?