When Mark is painting Olivia's portrait, her necklace beads are not all twisted together; there are two strands that are hanging separately. When they move away from the portrait, the necklace strings are all uniformly twisted together with no strands hanging loose.
After the ship docks in Liverpool the two lead characters are seated on the dock talking. In a close up of Milland while he says his lines, "... I must have talked incessantly..." there is a shadow across both shoulders. In an instant, in the wider shot, there is no such shadow.