Continuity mistake: When Harold sees Mary's wedding announcement in the newspaper, in the closeup we see two photos of Mary and Ronald with Mary on the left and Ronald on the right, but in the wideshot as the paper droops from Harold's hand, the photos are different and the left photo is of a male. (00:54:25)
Continuity mistake: Harold takes a bottle of chloroform away from his young nephew and puts it in his pocket. The label says "Chloroform, 2% alcohol." Twice at dinner, Harold looks at the bottle and a close-up is shown. In the second close-up the "2% alcohol" is missing from the label.