When Latour appears outside Keane's inn room, the wind is blowing wildly, whipping Latour's hair across his forehead; yet just a split-second later, after Latour has entered the room, his hair is perfectly combed without a hair out of place.
When Latour is seen in close-up in the court, there is a man on either side of him. In the long shots, there is nobody near him.
When Keane goes to the Paradine house in Cumberland, he walks over to Mrs. Paradine's piano. On the piano we see close-up of a page of music called Appassionata Op. 69 by Francesco Ceruomo. But in the next scene, when we see Keane passing by the piano, none of the three pages on it have any title at the top, only music, showing they are subsequent pages of that piece, and not the first one, as shown in the close-up.
When Keane travels to the Paradine country home, his train is seen entering the village from the left, framed by an overhanging tree branch. When Keane departs the village, a train is shown beneath the same branch departing from the right. It's the same shot, flipped for reuse.
Latour is in shadow when he first meets Mr. Keane, but it is plain that his lips are not moving when he speaks.