Continuity mistake: Sophie and Charlie are walking down a very steep street talking. Two female extras walk past them going uphill. Sophie and Charlie exit the small street and enter a piazza where the same two female extras walk past them again even though they have already passed by and should be up the steep street somewhere.
Continuity mistake: In the scene where Sophie, Charlie, and Claire are eating dinner, Claire goes to bed and leaves Sophie and Charlie at the dinner table. In one shot Sophie takes a sip of her wine and there is only a sip left. The next shot of her sipping her wine it is a quarter of the way full.