When Valentine Wilmot is talking to the costume shop owner; his right hand is leaning against the door frame. But on the next immediate cut; Wilmot's right hand is now off the door frame and in the process of moving toward the door frame to lean on it.
During the inquest, the handgun is repeatedly referred to as a revolver. It is obviously a small semiautomatic, and not a revolver.
The opening credits appear in the form of advertising posters on the sides of London buses. However, the negatives have been flipped before the posters were added because on the genuine posters beneath them the words are in mirror writing.
At the 1:24:38 mark a fly can be seen crawling on Anna May Wong's arm.