In the Tango de Roxanne scene, after Nini is dancing with the Argentinian, she moves away towards another actor. He comes up right behind her and holds on to her, but in the next scene where he is visible, it shows him coming towards her again and he hadn't reached towards her yet.
I don't believe this is a slip-up, the movie was created using quirky little effects like flicking back and forwards in time, mirrors, etc. It's what makes the movie so different. In this scene they've just quickly replayed that shot to emphasize the emotions that the dancers are trying to portray, I think it's actually very well done.
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