The final scene

It is almost possible that the narrative is cyclical save for a few things:

1. If the end is the beginning, Amadou (the African kid) would have to be in Anne's (Binoche) street, yet we can see him playing drums alongside his girlfriend in a completely different part of Paris. He is also dressed differently.
2. Maria (the beggar) is in a different outfit (pants not long skirt) and also is not carrying the yellow bag she had at the beginning.
3. When Georges (the boyfriend) arrives, it is raining, yet in the first scene it is definitely not.

Yet the film clearly implies a cyclical nature to the lives of these people: Georges is once again returning from a war torn country; Maria is back in the place she was deported from doing exactly as before; and Anne once again does not answer her phone, as something she says at the beginning informs us, 'In the bath I can't hear the phone.'

Also the reason for the whole chain of events kicked off by the initial humiliation of Maria by Jean, only occurs because Jean does not know the code for Anne and Georges' door. So at the end, when Georges does not know the new code, I would argue that Haneke is suggesting a whole new cycle of events (thus the 'incomplete' nature of the tales) is kicked off. All because the Code is Unknown. Pretty cool huh?