There is much inconsistency in the newspaper reports of Christine Clay's murder: one is published on Friday September 3rd 1937, but the next is dated Monday January 6th 1936. Another seems to be merely dated Tuesday.
During the performance of the first song heard and seen at the Grand Hotel, the drummer's visible playing (tapping on the drum head) does not nearly match the percussion sounds (cymbal strikes, drum rolls, rim shots, etc.) on the soundtrack.
About 50 minutes into the film, when Erica Burgoyne and Robert Tisdall have taken refuge at night in a small town, by parking her car next to a siding just before where the railroad underpasses a bridge, the entire scene has been staged and shot as an obvious miniature, as revealed by three mistakes: the somewhat jerky motion and unnatural lighting of an automobile (indicating that it was pulled) as it moves across the bridge, above the railroad; the express train speeding under the bridge drags a length of cord behind it, as it disappears from view; the camera tracking in closer to the parked automobile hidden in the shelter of freight trains on sidings, reveals that the figures of Erica and Robert are actually modeled and painted figurines, motionless until the shot suddenly changes to a medium close-up shot of the two actors.