the old woman's religious conversion(spoilers)
It seemed to me, judging by the quick flash of pictures, that she was supposed to have become a Catholic(or maybe already been a Catholic), and then some time later become a Jehovah's Witness. Judging by the magazines she was holding up.
Or was it that she just converted to Catholicism, and selling religious magazines is something that the screenwriter thinks Catholics do? Maybe some of them do, but that practice is very closely associated with the Jehovah's Witnesses.
Also, was it implied in one sequence that the bike thief would rape a woman in a park, go to jail, and then meet a violent end in prison? It was hard to tell exactly what was going on there.